Multiplication Tricks (7)

Algebra Level 1

Find the value of

28 2 \large { 28 }^{ 2 }

Try without the use of a calculator

Mental Math Tricks Wiki .
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The answer is 784.

Angela Fajardo by Angela Fajardo , 19, Philippines

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1 solution

Zee Ell
Nov 2, 2016

2 8 2 = ( 30 − 2 ) 2 = 3 0 2 − 2 × 2 × 30 + 2 2 = 900 − 120 + 4 = 784 28^2 = (30-2)^2 = 30^2 - 2×2×30 + 2^2 = 900 - 120 + 4 = \boxed {784}

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