Question

MEDALS FOR BEST ANSWERS.

Answer 1

5. How many real number solution does this equation have?
y=-4x^2+7x-8
a. no solutions
b. one solutions
c. two solutions
d.infinetely solutions.


6. how many real number solution does this equation have?
-8x^2-8x-2=0
a.one solutioin
b. two solutions
c. no solutions
d. infintely many solutions

9. Find the solutions in the system
y=x^2-5x+2
y=-6x+4
a. (2,8) and (-1, 2)
b. (-2,8) and (1,-2)
c. (-2,16) and (1,-2)
d. No solutions

10. Find the solutions to the system
y=x^2+8x+2
y=7x+4
a. (-2,-10) and (1,11)
b. (2,10) and (-1,-11)
c. (-2,-34) and (1,11)
d. no solutions

Answer 2

still need help with this or you're okay?

Answer 3

Still need help!

Answer 4

@helpme1.2

Answer 5

the second one has one solution, and the solution is x= -(1/2)

Answer 6

Okay!

Answer 7

so 6 has 1 solutions?

Answer 8

yes

Answer 9

Okay!

Answer 10

for number 9 and 10, you can use substitution to solve them

Answer 11

sry, the computer I'm using is acting up
brb I need to change a computer

Answer 12

Okay!

Answer 13

aright im back

Answer 14

okay:)

Answer 15

i cant do 9 or 10. i forgot how to do subsitution

Answer 16

for #9 use substitution
substitute the y
y=x^2-5x+2
y=-6x+4
when you sub it, it would be x^2-5x+2=-6x+4
then you can solve for the x

in this case, set one side of the equation in to zero
x^2-5x+2=-6x+4--->add 6x to both sides, then subtract 4 to both sides
x^2+x-2=0 ---> now factor out the problem
(x+2)(x-1)=0---> solve for the x's, then you would have
x=-2 and x=1
so it has two solutions

Answer 17

Oh okay, thats where i got stuck is when to solve for x.

Answer 18

But what would i be? Theres two answers. (-2,8) and (1,-2)
and (-2,16) and (1,-2)

Answer 19

plug the x values in the equation to find y
y=-6(1)+4
y=-2---->y value
y=-6(-2)+4
y=12+4
y=16---->y value

Answer 20

Okay! Thanks :) For number 10. i did x^2+8x+2=7x+4 then i subtracted 4 from both sides and got -2. And i subtracted 7x from both sides and got x.
So my equation is x^2+x-2. I dont know how to go from there.

Answer 21

factor out the problem
find two numbers when multiplied it gives you -2, and when add gives you 1x

Answer 22

I dont understand..

Answer 23

what two numbers gives you -2 when you multiply them?

Answer 24

-2 *1 = -2
-1*2 = -2
right ?
out of those two multiples, when one gives you 1 when added?

Answer 25

I feel so stupid.. i get when you ask what two number equals -2 but the last question you asked it confusing..

Answer 26

but you understand now right?

Answer 27

yes

Answer 28

did you get (x-1)(x+2)=0 when you factored x^2+x-2=0?

Answer 29

Yes, i couldnt understand the problem.

Answer 30

now you need to find the x
set the each factored form to 0 and solve for x
x-1 = 0
x=____
and
x+2 = 0
x=___

Answer 31

1 and 2??

Answer 32

1 and -2
remember
its x+2 = 0---to solve for x, subtract 2 to both sides
so it would be x = -2

Answer 33

Oh yeah. so number 10 is (-2,10) (1,11)?

Answer 34

no i mean(-2,-10) (1,11)

Answer 35

correct

Answer 36

number 5 has only one equation
so any number of x gives you y
so it has infinity many solutions

Answer 37

wait so number 5 has one of infinty?

Answer 38

*or

Answer 39

And could you help me with a story problem and a 2 other ones?

Answer 40

@helpme1.2

Answer 41

number 5 has only one equation
so any number of x gives you y
so it has infinity many solutions

Answer 42

Okay!!

Answer 43

Landon is standing in a hole that is 6.5 ft deep. He throws a rock, and it goes up into the air, out of the hole, and then lands on the ground above. The path of the rock can be modeled by the equation y = -0.05x² + 4.5x – 6.5, where x is the horizontal distance of the rock, in meters, from Landon and y is the height, in meters, of the rock above the ground. How far horizontally from Landon will the rock land? Round your answer to the nearest hundredth of a meter. (1 point)
18.07 m
35.96 m
9.04 m
71.93 m








13. A catapult launches a boulder with an upwark velocity pf 148 feet per second. the heigh of the boulder in feet after t seconds is given by the function h(t)=-16t^2+148t+30. how long does it take the boulder to reach its maximum height? What is the boulders maximum height?
a. Reaches a maximum height of 30 feet after 9.25 seconds
b. reaches a maximum height of 640.5 feet after 4.63 seconds
c. Reaches a maxmum height of 1,056.75 feet after 4.63 seconds
d. Reaches a meximum height of 372.25 feet after 4.63 seconds



21. Solve the equation by completeing the square
x^2-7x-4=0
a. 7.53, -0.53
b. -7.53, -0.53
c. -7.53, 0.53
d. 7.53, 0.53

Answer 44

Those are the last questions i need help with. Could you help me?

Answer 45

@helpme1.2

Answer 46

i'm not good at word problems, and I don't want to get you wrong in them, but I can help you with #21 completing the square

Answer 47

okay thats fine

Answer 48

?

Answer 49

to complete the square
x^2-7x-4 = 0 ---> Move the loose number(4) over to the other side.
x^2-7x = 4---> take half of the second x term, and add it to both sides, in this case we take half of 7, which Is 3.5
x^2-7x-3.5 = 4 - 3.5
now convert the left side of the equation to squared form
then square root both sides
the solve for the problem

the answer for your problem would be
x = {7.531128874, -0.531128874}

Answer 50

Thank you so much! you were such a big help :)

Answer 51

no problem

Answer 52

i passed! Thanks :)

Answer 53

yay :)