Question

Resolva a equação incompleta:
a)a) x²+3x.(x-12)=0

Answer 1

x²+3x (x-12)=0

x²+3x²-36x=0

4x²-36x=0

Δ=b²-4ac
Δ=(-36)²-4.4.0
Δ=1296

$x= \frac{36+-36}{8}$

x'=$\frac{36+36}{8} = \frac{72}{8} = 9$

x''= $\frac{36-36}{8} = \frac{0}{8} = 0$