Question

x² + 121 can be made a perfect square by adding​

Answer 1

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x^(2 )+ 121

x^(2) + (11)^ 2

(x+11) ^ 2 = x^2 + (2)(11)(x) + (11)^2

               = x^2 + 22x + 121

Therefore 22x should be added to x^2 + 121 to make it a perfect square.