Question

Factor completely, then place the factors in the proper location on the grid.

9 - 6a - 24a2

Answer 1

Set the factor '(1 + -2a)' equal to zero and attempt to solve:

Simplifying
1 + -2a = 0

Solving
1 + -2a = 0

Move all terms containing a to the left, all other terms to the right.

Add '-1' to each side of the equation.
1 + -1 + -2a = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -2a = 0 + -1
-2a = 0 + -1

Combine like terms: 0 + -1 = -1
-2a = -1

Divide each side by '-2'.
a = 0.5

Answer 2

I think..

Answer 3

The person on top is wrong

Answer 4

Oh. Okay.

Answer 5

9 - 6a - 24a2
First rearrange terms
-24a2 -6a +9
Now factor
-3(8x^2+2x-3)
By further simplifying the (8x^2+2x-3)
we get (-3)(2x-1)(4x+3) as the answer

Use this site as reference
http://www.purplemath.com/modules/factquad2.htm