Question

Dada f(x)=2x2+5x-3, determine f(-1)+2f(3)+4f(2)

Answer 1

Resposta: 114

f(x) = 2x²+5x-3

$f(-1)=2*(-1)^{2}+5*(-1)-3\\f(-1)=(2*1)-5-3\\f(-1)=2-8\\f(-1)=-6\\\\f(3)=2*(3)^{2}+(5*3)-3\\f(3)=(2*9)+15-3\\f(3)=18+12\\f(3)=30\\\\f(2)=2*(2)^{2}+(5*2)-3\\f(2)=(2*4)+10-3\\f(2)=8+7\\f(2)=15\\\\f(-1)+2f(3)+4f(2)\\(-6)+(2*30)+(4*15)\\-6+60+60\\120-6=\boxed {114}$

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