expand using identitiy a.(3x+2)(3x+4) b.(5a-7b)(5a-7b)
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Step-by-step explanation:
a. solving using the identity:
(x + a)(x + b) = x² + (a + b)x + ab
(3x+2)(3x+4) = (3x)²+ (2+4)3x+2*4
= 9x² + 18x + 8
b. solving using the identity:
(a-b)²= a²-2ab+b²
(5a-7b)²= (5a)²- 2*5a*7b + (7b)²
= 25a²- 70ab + 49b²
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