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Let f(x)=x^{2}+18x+7\ and\ g(x)=-3x^{2}+2x-9.f(x)=x^2 +18x+7 and g(x)=−3x^2 +2x−9. Identify the solution(s) of f(x)=g(x).f(x)=g(x).

User Nils Weinander
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1 Answer

9 votes
9 votes

Answer:

x = -2

Explanation:


f(x)=x^(2)+18x+7


g(x)=-3x^(2)+2x-9


f(x)=g(x)


\implies x^2 +18x+7=-3x^2 +2x-9


\implies 4x^2 +16x+16=0


\implies x^2 +4x+4=0


\implies (x+2)^2=0


\implies x+2=0


\implies x=-2

User Yunjin
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