Find (2x²-9) + (-9x²-4)

Answer 1

To find the sum of the expressions \( (2x^2 - 9) + (-9x^2 - 4) \), we will combine like terms:

1. Combine the \( x^2 \) terms: \[ 2x^2 + (-9x^2) = 2x^2 - 9x^2 = -7x^2 \]

2. Combine the constant terms: \[ -9 + (-4) = -9 - 4 = -13 \]

Now, putting it all together, we have: \[ (2x^2 - 9) + (-9x^2 - 4) = -7x^2 - 13 \]

So, the final answer is: \[ -7x^2 - 13 \]