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4(x+1)² -9 = (2(x-1))²-3²
a²-b²=(a+b)(a-b)
(2(x-1))²-3² = (2(x-1)-3)(2(x-1)+3)= (2x-5)(2x+1)
4(x+1)² -9 = (2(x-1))²-3²
a²-b²=(a+b)(a-b)
(2(x-1))²-3² = (2(x-1)-3)(2(x-1)+3)= (2x-5)(2x+1)