Hello :
1 / complete the square
(x² - 2(3)(x) + 9) - 9 + 7 = 0
(x - 3)² - 2 = 0
2/ solve the quadratic equation, x2-6x+7=0
(x - 3)² = 2
x - 3 = √2 or x - 3 = - √2
x = 3 + √2 or x = 3 - √2
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