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How would you evaluate f(-2) and f(a) for f(x) = 2x^2-x+5

How would you evaluate f(-2) and f(a) for f(x) = 2x^2-x+5
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How would you evaluate f(-2) and f(a) for f(x) = 2x^2-x+5

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User Alexei Shcherbakov
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\bf f(x)=2x^2-x+5\\\\ -------------------------------\\\\ f(-2)=2(-2)^2-(-2)+5\implies f(-2)=2(-2)(-2)-(-2)+5 \\\\\\ f(-2)=2(4)+2+5\implies f(-2)=8+2+5\implies f(-2)=15 \\\\\\ f(a)=2(a)^2-(a)+5\implies f(a)=2a^2-a+5
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User Boddhisattva
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