x² - 12x + 9 (Factorize)
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x² - 12x + 9=0
on comparing this eq with standard form of quadratic equation oax²+bx+c=0
we get
a= 1, b= -12 and c= 9
D= b²-4ac = 144-36 = 105
x= -b +-√D/2a = 12+- √105 /2
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