Question

Plz help me out to get the answer

Answer 1

`\large\boxed{-7x^2+4}`

Explanation:

`(2x^2+13)-(9x^2+9)=2x^2+13-9x^2-9\\\\\text{combine like terms}\\\\=(2x^2-9x^2)+(13-9)=-7x^2+4`

Answer 2

- 7z² + 4

distribute the brackets and collect like terms, noting that the second bracket is multiplied by - 1

(2z² + 13 ) - 1(9z² + 9 )

= 2z² + 13 - 9z² - 9 = (2z² - 9z²) + 13 - 9 = - 7z² + 4