Question

-2x²+18x-36=0 equação 2grau

Answer 1

Δ = b2 - 4.a.c 
Δ = 182 - 4 . -2 . 36 
Δ = 324 - 4. -2 . 36 
Δ = 612
x = (-b +- √Δ)/2a
x = ( -18 +- √612)/2.(-2)
x = ( -18 +- √612) / (-4)

x' = ( -18 + √612) / (-4)
x' = -18 + 3.2√17/ (-4) 
x'= -18 + 6√17/ (-4)
x'= -9 + 3√17 / (-2) ou -1,6846584384264904

x'' = (-18 - √612)/2.(-2)
x'' = -18 - 3.2√17/ (-4) 
x''= -18 - 6√17/ (-4)
x''= - 9 - 3√17 / (2) ou 10,68465843842649

 = 6,738633753705962 / -4   x'' = -42,73863375370596 / -4x' = -1,6846584384264904   x'' = 10,68465843842649