Question

qual o resultado de x2-6x+9=0

Answer 1

$x^{2} -6x+9=0\\\\ a=1;b=-6;c=9\\\\\\ \Delta=b^{2} -4ac\to \Delta= (-6)^{2} -4*1*9\to \Delta= 36-36\to \Delta= 0\\ \\\\x= \frac{-b+- \sqrt{\Delta } }{2a} \to x= \frac{-(-6)+- \sqrt{0 } }{2*1} \to x= \frac{6+- 0 }{2} \to \\\\\\x'=x''= \frac{6 }{2} \to x'=x''=3\\\\\\ S=(3)$

Answer 2

a = 1
b = -6
c = 9
Δ = b² - 4ac
Δ = (-6)² + 4.1.9
Δ = 36 - 36
Δ = 0 (delta zero apenas um resultado)
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      - b (+-)√Δ
x = -----------------
           2a
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x = 6 + √0
          2
x = 3