evaluate 10.2 square by using identity 1
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a + b) (a + b) = a(a + b) + b(a + b)
= a2 + ab + ba + b2
= a2 + 2ab + b2
= a2 + b2+ 2ab
Therefore, (a + b)2 = a2 + b2 + 2ab
Square of the sum of two terms = square of 1st term + square of 2nd term + 2 × fist term × second term
This is called the binomial square.
It is stated as: the Square of the binomial (sum of two unlike term) is the square of the first term plus the square of the second term plus twice the product of two terms.
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