Question

F(x)= - x2 + 20×-84
x2 ali o 2 e emcima do X

Answer 1

$F (x) = - x^{2} + 20 x - 84 F (x) = 0 - x^{2} + 20 x-84=0 (a= -1; b= 20; c=-84) Δ= 400-336 Δ= 64 X= -b +/- \sqrt{Δ} / 2.a X= -20 +/- \sqrt{64} /2(-1) X= -20 +/- 8 / -2 X'= 12 / -2 = -6 X''= -28 / -2 = 14$