Find the square of each number: 12, 10, 36, 81.* show work*

Many folks go to the trouble to memorize squares of numbers up to about 20 or even 30.

12² = 12×12 = 144

10² = 10×10 = 100

36² = 36×36 = 900 +360 +36 = 1296

81² = 81×81 = 6400 +160 +1 = 6561

In general, (a+b)² = a² +2ab +b².

You can use that here. For example, 36² = (30 +6)² = 30² +2×30×6 +6²

Of course 30² = (3×10)² = 3²×10² = 9×100.

and 2×30×6 = 2×3×6×10 = 36×10

Many calculators have an x² key that will give you the answer directly.

answer: y=4000x+14000

step-by-step explanation: