using identity. (a) (5x+3)² (b) 10½)² (c) (5x+3) (5x-3) (d) (63²-37²)
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Step-by-step explanation:
(a) (5x+3)²
using identity: (a+b)²= a²+2ab+b²
= (5x)²+2(5x)(3)+(3)²
= 25x²+30x+9
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