Answer
5(6a-5b)(a-b)
Work Step by Step
30$a^{2}$+5ab-25$b^{2}=
5(6$a^{2}$+ab-5$b^{2}$)=
5(6$a^{2}$-6ab+5ab -5$b^{2}$)=
5[6a(a-b)-5b(a-b)]=5(6a-5b)(a-b)
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