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3 years ago

Factor problems 18-20

Mathematics

1 answer:

Goryan [66]3 years ago

5 0

Answer:

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

___

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

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

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

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We know that
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