Question

formula de bhaskara x ao quadrado -3x quero armada da forma certa

Answer 1

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x² -3x=0 

a=1
b=-3
c=0

Δ=b²-4ac
Δ=(-3)²-4(1)(0)
Δ=9-0
Δ=9

$x= \frac{-b\pm \sqrt{\triangle} }{2a} ~=~~ \frac{-(-3)\pm \sqrt{9} }{2} =~~ \frac{3\pm3}{2} \\ \\ x'= \frac{3+3}{2} = \frac{6}{2} =3 \\ \\ x"= \frac{3-3}{2} = \frac{0}{2} =0 \\ \\ S=\{0,3\}$