Question

What missing number would complete the factorization x^2- 7x + 10 = ( x - 5 ) ( x - ? )

A. 1
B. 2
C. 4
D. 5

Answer 1

for ax^2+bx+c if that is factored to (x+d)(x+e)
then de=c

so

-5 times ?=10
divide both sides by -5
?=-2

so then
(x-2)
?=2 because the negative is already there



B is answer

Answer 2

Hey!

Hope this helps...

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The Answer is B. 2

Because when you foil (x-5)(x-2), you get:

(x-5)(x-2)

x^2 - 5x - 2x + 10

x^2 -7x +10