Question

. The sum of 5x², -7x², 8x², 11x² and -9x² is

Answer 1

Answer:

$5 {x}^{2} + ( - 7 {x})^{2} + 8 {x}^{2} + 11 {x}^{2} + ( - 9 {x})^{2} \\ \\ = 5 {x}^{2} - 7 {x}^{2} + 8 {x}^{2} + 11 {x}^{2} - 9 {x}^{2} \\ \\ = - 2 {x}^{2} + 8 {x}^{2} + 11 {x}^{2} - 9 {x}^{2} \\ \\ = 6 {x}^{2} + 11 {x}^{2} - 9 {x}^{2} \\ \\ = 17 {x}^{2} - 9 {x}^{2} \\ \\ = 8 {x}^{2}$

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Answer 2

Solution:

5x² + (-7x²) + 8x² + 11x² + (-9x²)

= (5x²+ 8x² + 11x²) - (7x² + 9x²)

= 24x² - 16x²

= 8x²

Hope this would help.