Help with alg. expressions..did I get it right?

Question

12xsquared - 24 - [ 2(xsquared - 1) + 7] = ?

I got 10xsquared - 19

Is that right?

Or did I do it wrong?

Answer 1

let me solve it

12x^2 - 24-[2(x^2-1)+7]

12x^2-24-(2x^2-2+7)

12x^2-2x^2-24+2-7

10x^2 - 29

sowee...you got it wrong... look at my solution and you'll get it

Answer 2

no, it's 10x^2-29

Answer 3

1) distribute 2 to ( x^2 - 1 )

>> 12x^2 - 24 - ( 2x^2 -2 +7 )

2) combine like terms in the parentheses

>> 12x^2 -24 - (2x^2 +5 )

3) distribute the - sign to ( 2x^2 + 5 )

>> 12x^2 -24 -2x^2 - 5

4) combine like terms

>> 10x^2 -29 <<