Question

quanto é x²-x-3x ? Obrigado!

Answer 1

x2-x-3x=0
x2-4x
X2=4x
x=2x
0=2x-x
x=0

Answer 2

$x^{2}$-x-3x

$x^{2}$-4x

$x^{2}$-4x=0

$x^{2}$]-4x-0=0

vou chamar o delta de D

D = $4^{2}$-4x1x0

D = 16

x' = -4+$\sqrt{16}$/2x1 = -4+4/2 = 0/2=0

x'' = -4-$\sqrt{16}$/2x1 = -4-4/2=-8/2=-4