Question

(70 points)

Answer 1

$f(x) = -0.26x^2 + 1.2x + 5.7\\\\\\f'(x)=(-0.26x^2 + 1.2x + 5.7)'=(-0.26x^2)'+(1.2x)'+(5.7)'=\\\\=-0.26(x^2)' + 1.2(x)' + (5.7)'=-0.26\cdot(2x) + 1.2\cdot1+0=\\\\=\boxed{-0.52x+1.2}$

Answer C)

Answer 2

f(x) = -0.26x^2 + 1.2x + 5.7

differentiate by x

f'(x) = -0.26*2x + 1.2

= -0.52x + 1.2

ans is C