what is (5x^2-4)+(-3x^2-9)?
thanks
you can only add terms with like powers of x. So,
5x^2 - 4 + -3x^2 - 9
= 2x^2 - 13
To simplify the expression (5x^2 - 4) + (-3x^2 - 9), you can combine like terms by adding the coefficients of the terms with the same exponent.
First, let's start by combining the x^2 terms. The expression has (5x^2 - 4) and (-3x^2 - 9).
When adding the x^2 terms, we have 5x^2 + (-3x^2). To add these terms, simply add their coefficients: 5 - 3 = 2. Therefore, the x^2 term becomes 2x^2.
Next, let's combine the constant terms. We have -4 + (-9). To add these terms, simply add their coefficients: -4 + (-9) = -13.
So, the simplified expression is 2x^2 - 13.
Final answer: 2x^2 - 13.