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= 11y + 10t -8y +5t
= 3y +15t
b. 4y^2 -5b-7 -(3y^2+2b -4)
= 4y^2 -5b-7 -3y^2 - 2b +4
= y^2 -7b -3
a. 11y +10t -(8y -5t)
= 11y +10t -8y +5t
= 11y -8y +10t +5t
= 3y +15t
b. 4y² -5b -7 -(3y² +2b -4)
= 4y² -5b -7 -3y² -2b +4
= 4y² -3y² -5b -2b -7 +4
= y² -7b -3
Itu jawabannya.