Question

Help please? :( I need it

Answer 1

One sec lemme post the question

Answer 2

A quadratic equation is shown below:

9x^2 - 16x + 60 = 0

Part A: Describe the solution(s) to the equation by just determining the discriminant. Show your work.

Answer:The discriminant is b^2-4ac, so that would be (16^2)-4(9)(60), which equals -1,904. This would have two complex roots because it is less than 0.

Part B: Solve 4x2 + 8x - 5 = 0 by using an appropriate method. Show the steps of your work, and explain why you chose the method used.

Answer: 4x^2 + 8x - 5 = 0 by grouping:
Multiply leading and trailing coefficients to get 4*-5 = -20
Find pair of factors of -20 that sum to 8: -2*10 = -20, -2+10 = 8
Rewrite it, splitting middle term with two factors:
4x^2−2x+10x−5
Now group into two groups
(4x^2−2x)+(10x−5)

Part C: Solve 2x2 -12x + 5 = 0 by using a method different from the one you used in Part B. Show the steps of your work.

Can someone help me with Part C? :/

Answer 3

I need it's help now :(

Answer 4

@BassCatcher15 @Whitemonsterbunny17 @phi @Gabebro13 @ganeshie8 @mathstudent55

Answer 5

Dude, you know I suck at complicated math stuffs.

Answer 6

Sorry, I just tagged everyone I knew who is online...

Answer 7

Annddd no one came :(

Answer 8

Except you of course...

Answer 9

Well... At least I have an awesome pic...

Answer 10

I like mine better...

Answer 11

I only need help with part C...

Answer 12

use the quadratic formula for part C

Answer 13

Can you show me how?

Answer 14

Khan can explain it faster. See
http://www.khanacademy.org/math/algebra/quadratics/quadratic-formula/v/using-the-quadratic-formula

Answer 15

@phi I don't think I did this right

Answer 16

Solve
\[ 2x^2 -12x + 5 = 0 \]
pattern match this equation with
\[ ax^2 +bx+c=0 \]
we see a=2, b= -12 , and c= 5
use those numbers to replace a,b, and c in the quadratic formula
\[ x= \frac{-b \pm \sqrt{b^2 -4ac}}{2a} \]
notice we use the discriminant, which you know how to find.
\( b^2 -4ac \) becomes 144 - 4*2*5= 144-40= 104

\[ x= \frac{12 \pm \sqrt{104}}{2 \cdot 2} \\ \frac{12}{4} \pm \frac{2\sqrt{26}}{4} \\ x= 3 \pm \frac{1}{2} \sqrt{26}\]

if we put one of these solutions into the original equation we will get zero (just as we should)

Answer 17

@LearningIsAwesome You need helps?

Answer 18

Yeah... can you help with this?

Answer 19

A ball is thrown upward from the top of a building. The function below shows the height of the ball in relation to sea level, ft, in feet, at different times t in seconds:
f(t) = -16t^2 + 32t + 90

The average rate of change of f(t) from t = 4 seconds to t = 6 seconds is _____ feet per second.

Answer 20

Ok
This is Quadratics
You need to make a parabola
So I'll make one
f(4) = -16(4)^2 + 32(4) + 90
f(6) = -16t^(6) + 32(6) + 90

Answer 21

f(4) = -16(4)^2 + 32(4) + 90
4096 + 128 + 90
4314

Answer 22

The second I need a second to do

Answer 23

f(6) = -16t^(6) + 32(6) + 90
-294

Answer 24

I am sorry the first was -38

Answer 25

So -38 and -294

Answer 26

But then how do we get the rate of change?

Answer 27

Ah yes, so rate of change.
-294 - -38 = -256
6 - 4 = 2
-128 is your answer

Answer 28

Thanks! Can you help with another one?

Answer 29

Rate of change:
rise/run
Ok I'll help but we chat while I make sandwhich in the math chats down below, deal?

Answer 30

Deal.
A company launched four new products. The market price of the four products after different number of years is shown below:

Table displaying data. The first column one shows the heading number of years, and rows product 1, product 2, product 3, product 4. The next column heading says 1 with rows 4.80, 3.20, 3.20, and 4.00. The next column header says 2 with rows 5.20, 7.40, 5.80 and 6.00. The next column header says 3 with rows 5.20, 12.60, 7.80 and 10.00. The last colunn heading says 4 with rows 4.80, 19.80, 10.20, 18.00.

Based on the data given, the price of which product will eventually exceed all others?

Product 1

Product 2

Product 3

Product 4