Question

Factor completely. Write prime, if it is not factorable 23. x2 12x + 20 24. x2-25...

Factor completely. Write prime, if it is not factorable 23. x2 12x + 20 24. x2-25 25. 3x2+18x 26. x26x +9 27. 2x26x-56 28. -x

Factor completely. Write prime, if it is not factorable 23. x2 12x + 20 24. x2-25 25. 3x2+18x 26. x26x +9 27. 2x26x-56 28. -x2-7x +8 29. 2x2 +17x+ 21 30. 9x2-5x- 10
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Answer #1

2 - 12 20

+ 20 10x - -2

(x-10)-2(x - 10)

(x-10) (a- 2

.

.

3218.

3r T3 6

3ax (x 6

.

.

2.r26 56

2 (r3 28

2 ( 7x4x 28)

=2\left(x(x+7)-4(x+7)\right)

= 2 (r- 4) (x7)

.

.

2x^2+17x+21

=2x^2+14x+3x+21

=2x (x+7)+3(x+7)

{\color{Red} =(x+7)(2x+3)}

.

.

x^2-25

2-5

{\color{Red} =(x+5)(x-5)}

.

.

x^2+6x+9

=x^2+3x+3x+9

=x(x+3)+3(x+3)

{\color{Red} = (x+3)(x+3)}

.

.

-x^2-7x+8

=-\left(x^2+7x-8\right)

=-\left(x^2+8x-x-8\right)

=-\left(x (x+8)-1(x+8)\right)

{\color{Red} =-\left(x-1\right)\left(x+8\right)}

.

.

92-5-10

{\color{Red} prime}

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