Question 836110
Q:
If (x-2)(x+3)=k, what is (x-4)(x+5)?
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A:
(x-4)(x+5) = {{{x^2 + x - 20}}}
           = {{{x^2 + x - 6 - 14}}}
           = (x - 2)(x + 3) - 14
           = {{{highlight(k - 14)}}}