can anyone help with this please>???????
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a) ab + 4b² + 2a² + 7a² - 7b² - 24ab
= ab - 24ab + 4b² - 7b² + 2a² + 7a²
= 23ab - 3b² + 9a²
b) x² + 40xy + y² + 17x² - 20xy + 16y²
= x² + 17x² + 40xy - 20xy + y² + 16y²
= 18x² + 20xy + 17y²
c) 15rs + 17rs
= 32rs
d) 20pq + 40pr + 40pr - 20pq
= 20pq - 20pq + 40pr + 40pr
= 80pr
e) -1 + xy + 14xy² + 10xy² + 2y - 5
= -1 - 5 + xy + 14xy² + 10xy² + 2y
= -6 + xy + 24xy² + 2y
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