What is the quickest way to solve this?

5+7 =12 12 x 12 =144

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This is not quick. 7+5=12 ^2 = 144

I'm stem from a generation which knows and memorized the big multiplication table

12^2

144, under a second

Think this is a wind up. Quickest way take seconds 12 x 12 = 144

The answer is correct. Each individual should use the method they are most comfortable with. Teachers should teach each method and allow students to use the method of their choice. The point is to get the correct answer. We should stop trying to jam a round peg into a square hole

Just add the numbers inside the () and square it

a2+2ab+b2