Factor problems 18-20

18. which are the factors of the expression 3x2 + 23x – 8?
a (3x + 1)(x – 8)
b (3x – 8)(x + 1)
c (3x – 1)(x + 8)
d (3x – 1)(x – 8)

19. which of the following is equal to x2 + 4x + 3?
a (x + 1)(x + 3)
b (x + 2)(x + 2)
c (x + 4)(x – 1)
d (x – 4)(x – 1)

20. which shows 3x2 – 8x + 4 completely factored?
a (3x – 2)(x + 2)
b (3x + 4)(x – 1)
c (x + 4)(3x – 1)
d (3x – 2)(x – 2)

show all of your work

18. C (3x -1)(x +8)

19. A (x +1)(x +3)

20. D (3x -2)(x -2)

Step-by-step explanation:

Since you know how to multiply binomials, you can easily check any of the offered answers to see if they work.

(ax +b)(x +c) = ax² +(b+ac)x +bc

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18. All of the constants except for choice D multiply to give -8, so you must check the middle term:

A b+ac = 1-24 = -23 ≠ 23

B b+ac = -8+3 = -5 ≠ 23

C b+ac = -1+24 = 23 . . . . . this is the answer

D already eliminated because bc = 8 ≠ -8

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19. The only answer with constants that multiply to give +3 is A.

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20. The only answer with constants that multiply to give +4 is D.

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

me! what did you put for this question?

step-by-step explanation: