9/10a²-15/2a²+25 when a=2 evaluate using identities
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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.
= 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.
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