Question

Subtract. (4x^2+8)-(2x^2+9)

Answer 1

Remove the parentheses first:
\[4x^2 + 8 - 2x^2 - 9\]
Being careful to distribute the negative to both parts of the second term.
Then combine like terms:
\[2x^2-1\]

Answer 2

when it comes to things with the same power you subtract the coeficents in front of them so 4-2=2
then 8-9 = -1 its a -9 since the parenthesis has the - right before it