Question

add the following:7x²-4x+5,-3x²+2x-1,5x²-x+9​

Answer 1

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$7 {x}^{2} - 4x + 5 + ( - 3 {x}^{2}) + 2x - 1 + 5 {x}^{2} - x + 9 \\ \\ 7 {x}^{2} - 4x + 5 - 3 {x}^{2} + 2x - 1 + 5 {x}^{2} - x + 9 \\ \\ 7 {x}^{2} - 3 {x}^{2} + 5 {x}^{2} - 4x + 2x - x + 5 - 1 + 9 \\ \\ = 9 {x}^{2} - 3x + 13$

Answer 2

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To Do:

• Add (7x²-4x+5), (-3x²+2x-1), (5x²-x+9)

Solution:

$:\longrightarrow (7x^2 - 4x + 5) + (-3x^2 + 2x - 1) + (5x^2 - x + 9) \\:\implies 7x^2 - 4x + 5 - 3x^2 + 2x - 1 + 5x^2 - x + 9 \\:\implies (7x^2 - 3x^2 + 5x^2) + (-4x + 2x - x) + (5 - 1 + 9)</p><p>\\\bf{:\implies 9x^2 - 3x - 13}$

Hope it helps!!