Respostas

2014-03-05T10:00:04-03:00
4x:2-5=3x(x-4)
4x:2-5=3x²-12x
2x-5=3x²-12
-3x²+2x+12x-5=0
-3x²+14x-5=0
Δ=14²-4×(-3)×(-5)
Δ=196-60
Δ=136
x=-14+-√136/-6
x=-14+-2√34/-6 ÷2
x=-7+-√34/-3
x1=7-√34/3
x2=-7+√34/3