Key formulas:
(a+b)2=a2+2ab+b2,
(a−b)2=a2−2ab+b2.
Do not forget the middle term ±2ab.
Square of the first + double product + square of the second
For a square of a difference, the middle term has a minus sign
The formulas work in both directions
Expand using the square-of-a-sum or square-of-a-difference formulas.
Square of sum
(x+5)2
=x2+10x+25
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