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3.
a.x²+2x+2x²+x+3x²+1=6x²+3x+1.
b.5a-5b-5a+5b=0
c.y²+13y³+y²-13y²=-11y²+13y³
d.pq-r²+3pq+3r²=4pq+2r²
4.
a.(p²+3)+(-p²+3)=p²+3-p²+3=9
b.(4y²-y+8)+(8y²-y-4)=4y²-y+8+8y²-y-4 =12y²-2y4+4
c.(5p-3q-r)+(-p-2q+3r)=5p-3q-r-p-2q+3r =4p-5q+2r
d.(x²-3x+8)+(-x²+3x)=x²-3x+8-x²+3x=8
5.
a.3(x-2)-6(2x+3)=3x-6-12x-18=-9x-24
b.(p²-3p+6)-(3p²-3p+3)=p²-3p+6-3p²+3p-3 =-2p²+3
c.y(2-y)-(y²-w-1)=2y-y²-y²+w+1 =2y²-2y²+w+1
d.(4-t-t²)-(-(t-t²))=4-t-t²-(-t+t²)=4-t-t²+t-t² =4-2t².
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