4.
=(3m-n)²
5.
=(5a-3b)(5a+3b)
6.
=2²-(3x)²=4-9x²
7.
=(m+n)(m²-mn+n²)
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Verified answer
4.
=(3m-n)²
5.
=(5a-3b)(5a+3b)
6.
=2²-(3x)²=4-9x²
7.
=(m+n)(m²-mn+n²)