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4a+4b=4(a+b)
2xy-3xy= xy(2-3)
9.(x+7)(2x-1)=2x^2-x+14x-7=2x^2+13x-7
(2a-1)(a+4)=2a^2+8a-a-4=2a^2+7a-4
(x+5y)(7x-y)=7x^2-xy+35xy-5y^2=7x^2-5y^2+34xy
10/ P=(x+5)(x-2)
P=x^2-2x+5x-10
P= x^2+3x-10
reszta jest w załączniku :D