Evaluate
156x^{2}-144
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156x^{2}-144
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12^{2}x^{2}-144+12x^{2}
Expand \left(12x\right)^{2}.
144x^{2}-144+12x^{2}
Calculate 12 to the power of 2 and get 144.
156x^{2}-144
Combine 144x^{2} and 12x^{2} to get 156x^{2}.
12^{2}x^{2}-144+12x^{2}
Expand \left(12x\right)^{2}.
144x^{2}-144+12x^{2}
Calculate 12 to the power of 2 and get 144.
156x^{2}-144
Combine 144x^{2} and 12x^{2} to get 156x^{2}.
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