What is 9x^2+4x-(-4)x^2-7 ?

The solution to 9x^2+4x-(-4)x^2-7 is 13x^2+4x-7

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simplify 9x^2+4x-(-4)x^2-7

simplify

9 x^{2} + 4 x - (- 4) x^{2} - 7

13 x^{2} + 4 x - 7

Solution steps

9 x^{2} + 4 x - (- 4) x^{2} - 7

Group like terms

= 9 x^{2} - (- 4) x^{2} + 4 x - 7

Add similar elements:

9 x^{2} - (- 4) x^{2} = 13 x^{2}

= 13 x^{2} + 4 x - 7

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