(x+5)² = x² + 10x + 25 (x-4)² = x² - 8x + 16 (a-2)(a+2)= a² - 4
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(x+5)² = x² + 10x + 25
(x-4)² = x² - 8x + 16
(a-2)(a+2)= a² - 4
(x-4)²=x²-8x+16
(a-2)(a+2)=a²-4