Uprość wyrażenia:
2(a-5b)²+3a(b-3)²-(4a+5)(4a-5)
2(a-5b)²+3a(b-3)²-(4a+5)(4a-5)=
=2(a²-10ab+25b²)+3a(b²-6b+9)-(16a²-25)=
=2a²-20ab+25b²+3ab²-18b²+27a-16a²+25=
=-14a²+7b²+3ab²-20ab+27a+25
2(a-5b)²+3a(b-3)²-(4a+5)(4a-5)=2(a²-10ab+25b²)+3a(b²-6b+9)-16a²-25=2a²-20ab+50b²+3ab²-18ab+27a-16a²-25=-14a²-38ab+50b²+27a-25
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2(a-5b)²+3a(b-3)²-(4a+5)(4a-5)=
=2(a²-10ab+25b²)+3a(b²-6b+9)-(16a²-25)=
=2a²-20ab+25b²+3ab²-18b²+27a-16a²+25=
=-14a²+7b²+3ab²-20ab+27a+25
2(a-5b)²+3a(b-3)²-(4a+5)(4a-5)=2(a²-10ab+25b²)+3a(b²-6b+9)-16a²-25=2a²-20ab+50b²+3ab²-18ab+27a-16a²-25=-14a²-38ab+50b²+27a-25