i need help subtracting like terms?

Question

Subtract
4y²+7y−7 from 5y²-y+3.

Answer 1

(5y² - y +3) - (4y² + 7y -7) =

 

Group by like terms

 

(5y² - 4y²) + ( - y - 7y) + (3 + 7) =  parentheses are not strictly necessary their use highlights the grouping process

 

y² - 8y + 10