Question

x ao quadrado - 6x + 9 = 0 ​

Answer 1

Resposta:

x²-6x+9=0

delta=(-6)²-4×1×9

delta=36-36

delta=0

$x = \frac{ - ( - 6) + - \sqrt{0} }{2 \times 1} \\ x = \frac{6 + - 0}{2} \\ x {}^{1} = x {}^{2} = \frac{6}{2} = 3$