What is the sum of x^2-3x+7 and 3x^2+5x-9

Answer 1

Answer is 4x² + 2x - 2.

Group together your like terms - terms with the same variable to the same power.

This can be done by rewriting the equation vertically or horizontally.

x² - 3x + 7

+ 3x² + 5x - 9

= 4x^2. + 2x - 2

or (x² + 3x²) + (-3x + 5x) + (7 - 9) = 4x² + 2x - 2

Answer 2

(x² - 3x - 7) + (3x² + 5x - 9) = 4x² + 2x - 2

Remove both parenthesis: x² - 3x + 7 + 3x² + 5x - 9

Combine like terms: 4x² + 2x - 2