a2+8a+15 - (a+3)(a+5), a2+2a-15 - (a-3)(a+5), a2-2a-15 - (a+3)(a-5), a2-8a+15 - (a-3)(a-5), a2+6a+8 - (a+2)(a+4), a2+2a-8 - (a-2)(a+4), a2-2a-8 - (a+2)(a-4), a2-6a+8 - (a-2)(a-4), a2+8a+16 - (a+4)2, a2-8a+16 - (a-4)2, a2-16 - (a+4)(a-4), 2a2+5a-3 - (2a-1)(a+3), 2a2-5a-3 - (2a+1)(a-3), 6a2-a-12 - (2a-3)(3a+4),

Expanding Double Brackets

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