Question

20×2-35×-31=0 me ajudem nessa equação do 2 grau por favor

Answer 1

Resposta:

Δ

$= b^{2} -4ac\\=(-35)^{2}- 4*20*(-31)\\=1225 + 2480\\= 3705$

x'

$x=\frac{-(-35)-\sqrt{3705} }{2*20}\\\\=\frac{35-\sqrt{3705} }{40}\\\\=\frac{35-(60.86)}{40}\\\\=\frac{-25.86}{40}=\\\\x' = -0,64$

x''

$x=\frac{-(-35)+\sqrt{3705} }{2*20}\\\\=\frac{35+\sqrt{3705} }{40}\\\\=\frac{35+(60.86)}{40}\\\\=\frac{96.86}{40}=\\\\x'' = 2,39$