Question

2- Dada a função f(x)=-x²+5x+6, calcule quando possivel.

a) f(-1)
b) f(√2)
d) x para f(x)=0
f) xpara f(x)=20

Answer 1

$f(x)=- x^{2} +5x+6 \\ a)f( \sqrt{2})=(- \sqrt{2})^2+5.( \sqrt{2})+6=8+5 \sqrt{2} \\ b)f(x)=0 \\ f(0)=0 \\ c)f(20)=400+5.20+6=400+100+6=506$