Answers

2014-08-03T13:50:35+08:00
(a+b)²=a²+2ab+b²
(x+y)²=x²+2xy+y²
(x+4)²=x²+8x+16

Square the first and last term  (first and third term)
and multiply both terms and 2 (middle term)
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2014-08-03T13:55:03+08:00
1. A^2 + 2ab + b^2
2. x^2 + 2xy + y^2
3. x^2 + 8x + 16

( "^" stands for Exponents.)
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