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= 4b - 7b - 3b + 5a - 2a
= -6b + 3a
b. 3p + 2q + 1 - 2p + 4q + 6
= 3p - 2p + 2q + 4q + 1 + 6
= p + 6q + 7
c. 2m (4m - 3 ) - 3 (m - 2 n)
= 8m2 - 6m - 3m + 6n
= 8m2 - 9m + 6n
d. 7y + 3x (4y - x ) - 5y (1 - x ) + 5x2
= 7y + 12xy - 3x2 - 5y + 5xy + 5x2
= 7y - 5y + 12xy + 5xy - 3x2 + 5x2
= 2y + 17 xy + 2xy2
Nb: angka 2 pd belakang variabel berarti pangkat 2.
maafkalausalah