Question

Qual é a resposta de 2 x²-10x-12=0

Answer 1

Usa a formula do delta
Δ=b²-4(a×c)
a=2
b=-10
c=-12
Δ=(-10)²-4(2×-12)
Δ=100+96
Δ=196

x=$\frac{-b+/- \sqrt{Δ} }{2a}$
x=$\frac{-(-10)+/- \sqrt{196} }{2×2}$
x=$\frac{10+/-14}{4}$
x1=$\frac{10+14}{4} = \frac{24}{4} =6$
x2=$\frac{10-14}{4} = \frac{-4}{4} =-1$

Answer 2

$2x^2-10x-12=0 \\ \\ \\ D=(-10)^2-4.2.(-12) \\ \\ D=100+96 \\ \\ D=196 \\ \\ \\ x'=\frac{-(-10)+ \sqrt{196} }{2.2} \>\>\>\>\>\>x'= \frac{10+14}{4} \>\>\>\>\>\>x'=6 \\ \\ x"= \frac{-(-10)- \sqrt{196}} {2.2} \>\>\>\>\>\>x"= \frac{10-14}{4} \>\>\>\>\>\>x"=-1$