Question

Find the values of X.

a) X
$x {}^{2} - 22x + 121 = 0$
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Answer 1

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Factor using the perfect square trinomial rule a2+2ab+b2=(a+b)2 a 2 + 2 a b + b 2 = ( a + b ) 2 , where a=x a = x and b=11 b = 11 . Set the x+11 equal to 0 . Subtract 11 from both sides of the equation.