Answers

2016-06-23T10:04:04+08:00
1.because they have patterns need to be follow.
2.product of two binomials
(a+b)(c+d)=ac+ad+bc+be
product of the sum &difference of the same two terms
(a+b)(a-b)=a²-b²
square of binomial
(a±b)²=a²±2ab+b²
cube of binomial
(a+b)³=a³±3a²b+3ab²±b³
product of binomial and trinomial
(a+b)(a²-ab+b²)=a³+b³
(a-b)(a²+ab+b²)=a³-b³
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