ekkpW4in2whEgger ekkpW4in2whEgger

14-12-2016
Biology

contestada

WILL UPVOTE!
Factor the expression.
x^2 - 49 =

Respuesta :

kelseyljh kelseyljh

14-12-2016

answer: (x+7)(x-7)

how to get answer:
x^2-49 rewrite as
x^2-7^2
use diff of perf squares: a^2-b^2=(a+b)(a-b)
(a=x, b=7)
fill in the formula of the parenthesis
(x+7)(x-7)

to check you answer is correct, you can foil the answer (x+7)(x-7)

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