(x-3)(x+5) simplify using formula – InterviewSolution

1.

(x-3)(x+5) simplify using formula

Answer»

(a+b)(a+c)

= a²+ac+ab+ab+bc

=a² +2ab+c(a+b)

here a=X

b=-3

c=5

so...

x²+2(x)(-3)+5(x-3)

=x²-6x+5x-15

=x²-x-15

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