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OverLord2011 [107]
4 years ago
15

Factor x2 – 8x + 15. Which pair of numbers has a product of ac and a sum of b?

Mathematics
1 answer:
vichka [17]4 years ago
8 0

Answer:

(x - 5)(x - 3)

Step-by-step explanation:

{x}^{2}  - 8x + 15 \\   = {x}^{2}  - 5x - 3x + 15 \\   = x(x  -  5) - 3(x - 5) \\  = (x - 5)(x - 3) \\  \\ ac = ( - 5) (- 3) = 15 \\ a + c =  - 5 - 3 =  - 8

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