a) M=\(8y^5-3y+1\)
N=\(-y^5+11y^3-2y\)
b) N+M=\(\left(8y^5-3y+1\right)\)+ \(\left(-y^5+11y^3-2y\right)\)
N+M= \(7y^5\)\(+11y^3\)\(-5y\)\(+1\)
M-N=\(\left(8y^5-3y+1\right)\) \(-\)\(\left(-y^5+11y^3-2y\right)\)
M-N=\(9y^5\)\(-11y^3\)\(-y\)\(+1\)
N-M=\(\left(-y^5+11y^3-2y\right)\) \(-\) \(\left(8y^5-3y+1\right)\)
N-M=\(-9y^5\)\(+11y^3\)\(+y\)\(-1\)