(a-b)(a+b)= a²-b²
(4√2-√7)(4√2+√7)= (4√2)²-(√7)²= 32-7= 25
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(a-b)(a+b)= a²-b²
(4√2-√7)(4√2+√7)= (4√2)²-(√7)²= 32-7= 25