(3x-2) (3x+7)using identity
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Answer: = 3x(3x - 7 ) + 2(3x - 7)
= 9x^2 -21x+6-14
=9x^ -15x -14 = 9x^2 -21x +6x -14
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Step-by-step explanation:
(x+a)(x+b) = x2 + x(a+b) + ab
Let x be equal 3x, a be -2 and b be 7
Therefore using the identity,
(3x + -2)(3x + 7) = (3x)2 + 3x(-2+7) + (-2 * 7)
= 9x2 + 3x*5 + -14 = 9x2+ 15x -14
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