multiply using appropriate identity
1. (x + 7) (x + 7)
2.(3x + 1 ) ( 3x - 8 )
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Answer:
1) (x+7)^2 = x^2 + 2.x.7 + 7^2
= x^2 + 14x + 49
2) (3x+1)(3x-8) = (x+a)(x-b)
= x2 + x(a-b) - ab
= 9x2 - 7(3x) - 8
= 9x2 - 21x - 8
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