(a-2)(a+2)+(a+2)^2 = (a+2)(a-2+a+2) = 2a(a+2) = 2a^2 + 4a
(A+B)(A-B)=A²-B²
(A+B)²=A²+2AB+B²
(a-2)(a+2)+(a+2)²=a²-4+a²+4a+4=2a²+4a=2a(a+2)
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(a-2)(a+2)+(a+2)^2 = (a+2)(a-2+a+2) = 2a(a+2) = 2a^2 + 4a
(A+B)(A-B)=A²-B²
(A+B)²=A²+2AB+B²
(a-2)(a+2)+(a+2)²=a²-4+a²+4a+4=2a²+4a=2a(a+2)