Question

How do you subtract `3y^2 -5y-4` from the sum of `4y^2 +3y -5 and -5y^2 +1y+1?`

Answer 1

`-4y^2+9y`

Explanation:

You need to add the last two expressions together first and then subtract the first expression from your answer.

However, this can be done as one process, if you remember that subtracting is the same as adding the inverse. (change the signs)

Make sure that you add the like terms together:

`+4y^2 +3y -5`
`-5y^2 +1y+1`
`ul(color(blue)(-3y^2 +5y+4))" "larr` the signs have been changed
`ul(-4y^2+9y+0)`