Question

Quadratic Formulas - 10 questions
tried 6 times and failed epically. just don't get it.

1) When the sum of 5 and twice a positive number is subtracted from the square of the number, 0 results. Find the number.

2) 2/5x^2 -x+ 19/15 =0

3) .6x^2 = 1.2x +0.6

4) A rule for estimating the number of board feet of lumber that can be cut from a log depends on the diameter of the log. To find the diameter required to get 121 board ft of lumber, the equation (d-4/4)^2 = 121.
are both answers reasonable?

5) 9x^2 -7x -5=0

6) 5x^2 - 2x +13 = 18x +1

7) 6p^2 = -19p -3

8) 5x^2 = -20x

Answer 1

9) I can do this one :)

10) 5x^2 = 3 +2x

Answer 2

Do you know the quadratic formula?

Answer 3

ax2 + bx +c = 0

Answer 4

x^2

Answer 5

You have to put it in that form for the quadratic formula.

Answer 6

I did 8&9

Answer 7

oh the x = -b (sqrt b-4(a)(c))/ 2(a)

Answer 8

Yes, \[x =\frac{ -b \pm \sqrt{b^2-4ac} }{ 2a}\]

Answer 9

you have to plug in the points.

Answer 10

Try #1.

Answer 11

x^2 + 2x+5=0
?

Answer 12

To do this, you can plug in the points to get:

Answer 13

wait keep in mind if it is just x^2, the value is 1

Answer 14

Okay so you would have \[x=\frac{ -2\pm \sqrt{(2)^2-4(1)(5)} }{ 2(1) }\]

Answer 15

I gtg, will be on tomorrow can you help then?

Answer 16

no available computer till tomorrow

Answer 17

Okay.

Answer 18

Thank You so much. Very appreciated

Answer 19

Your welcome.

Answer 20

um...so did you still want to help me? lol

Answer 21

Can you make a post for each question so its easier to help? .-.

Answer 22

I mean, yeah I can lol.

Answer 23

Thanks :3