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a) 2a²+7=a(1+2a)=
=2a²+7=a+2a²=
=4a²+a+7
b)3a(a-1)=a(3a-2)=
=3a²-3a=3a²-2a=
=6a²-5a²
c)2a-a²+a(2+a)=a+18=
=2a-a²+2a+a²=a+18=
=5a+18
d)a²+5=5a(0,2a+3)=
=a²+5=10a²+15a=
=11a²+15a+5
Proszę.