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F(x) =X²+2X find f(3)-7

User Bubunyo Nyavor
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1 Answer

23 votes
23 votes

Given function :


f(x)=x^2+2x

We need to find the value of f(3) -7

substitute the value of x=3 in the given expression and then subtract 7 from it


\begin{gathered} f(x)=x^2+2x \\ \text{for x=3,} \\ f(3)=3^2+2(3) \\ f(3)=9+6 \\ f(3)=15 \\ \text{ Since, we have to find the value of f(3)-7} \\ \text{subtitute the value of f(3) and simplify} \\ f(3)-7=15-7 \\ f(3)-7=8 \end{gathered}

Answer : f(3)-7 = 8

User Supita
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