Question

Quadratic function help:
attachment below!

Answer 1

Area of full rectangle - area of 4 trimmed rectangles.
5*3 - 4 * x* x

Do you understand this?

Answer 2

Yeah I got that, so it's the triangle minus the four cornered squares?

Answer 3

rectangles* NOT triangle. lol.

Answer 4

sorry, yeah rectangle**

Answer 5

And yes sir.

Answer 6

ma'am* lol

Answer 7

D:
Sorriee.

Answer 8

it's okay!

Answer 9

Alright ma'am, so if you simplify this:
5*3 - 4 * x* x
you'll your expression in part (a)

Answer 10

4x^2?

Answer 11

You forgot 5*3

Answer 12

15 - 4x^2

Answer 13

so the area of the rectangle becomes 15 - 4x^2

Answer 14

Yep.

Answer 15

For part b, set this expression equal to 10.

Answer 16

10 = 15 - 4x^2
5 - 4x^2 = 0

Answer 17

Awesome! Solve for x now.

Answer 18

x = \[\sqrt{5/2}\]

Answer 19

that will work too.
Mind it it's 4 not 2.

Answer 20

1.11 is the answer.

Answer 21

heya!

yeah, I just finished it lol and checked with your answer, it's right!

\[15-4\sqrt{5/4} ^2 = 10\]