is 40y-4y²+10-y the correct expansion for
(4y+1)(10-y)?

Question

is 40y-4y²+10-y the correct expansion for 
(4y+1)(10-y)?

anonymous · Answer

(4y+1)(10+y)
= 40y + 4y^2+10-y

chaise · Answer

Nope - do you need help with FOIL?

(4y+1)(10-y)
= (4y*10)-(4y*y)+(1*10)+(1*-y)
= 40y - 4y^2 +10 -y
= 39y - 4y^2 +10
= -4y^2+39y+1-

anonymous · Answer

Well it was still right but I could have gone one more step down right?

chaise · Answer

Oh, yes, you were right, it just wasn't the simplified version. Whenever you see terms that can be simplified you should always simplify them.
For example in an equation you wouldn't leave it as 8+2, you would write 10. Same goes for variables.
40y - y = 39y.

anonymous · Answer

right right. Thanks alot bros.