1)y-(y-(2y-4)= y-(2y^2-4y)=2y^3-4y^2
2) (2a+5b)+(8a-11b)=16a^2-22ab+40ab-55b^2=16a^+18ab-55b^2
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1)y-(y-(2y-4)= y-(2y^2-4y)=2y^3-4y^2
2) (2a+5b)+(8a-11b)=16a^2-22ab+40ab-55b^2=16a^+18ab-55b^2