Question

Subtract 7x^2−5xy+8y2 from −2x^2−15xy+9y^2

Answer 1

Subtract
`7x^2 -5xy+8y^2` from
`-2x^2 -15xy+9y^2`

then;

`-2x^2 -15xy+9y^2 - (7x^2 -5xy+8y^2)`

Remove the bracket we have;

`-2x^2 -15xy+9y^2 - 7x^2 + 5xy - 8y^2`

Like terms are those terms which have same variable to the same power.

Combine like terms;

`-9x^2 -10xy+y^2`

Therefore, Subtracting
`7x^2 -5xy+8y^2` from
`-2x^2 -15xy+9y^2` we get
`-9x^2 -10xy+y^2`