(5n+2)²-(3n-2)²
25n²+20n+4-(9n²-12n+4)
25n²+20n+4-9n²+12n-4
16n²+32n
16(n²+2n)
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(5n+2)²-(3n-2)²
25n²+20n+4-(9n²-12n+4)
25n²+20n+4-9n²+12n-4
16n²+32n
16(n²+2n)