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x² +3x +2 -(4x² +2x -7)
= x² +3x +2 -4x² -2x +7
= x² -4x +3x -2x +2 +7
= -3x +x +9
b. Dibalik dahulu, sehingga :
5(p² +2pq) -(2(2p² +pq)
= 5p² +10pq -(4p² +2pq)
= 5p² +10pq -4p² -2pq
= 5p² -4p +10pq -2pq
= p² +8pq
Itu jawabannya.
= x^2-4x^2+3x-2x+2+7
=-3x^2+x+9
b. 5(p^2+2pq) - (2(2p^2+pq)
= 5p^2+10pq -(4p^2+2pq)
=5p^2-4p^2+10pq-2pq
=p^2+8pq
=p(p+8q)