Question

Multiply
(y^2-3)(5y^2-7y+4)

Answer 1

5y^4 -7y^3 -11y^2 +21y -12

Answer 2

(y^2-3)(5y^2-7y+4)


y^2(5y^2-7y+4)-3(5y^2-7y+4)


5y^4-7y^3+4y^2-15y^2+21y-12


5y^4-7y^3-11y^2+21y-12


So (y^2-3)(5y^2-7y+4)=5y^4-7y^3-11y^2+21y-12