Question

$a)3 {x}^{3} - 2 {x}^{2} + 4x + 5$
-
${x}^{3} + {x}^{2} - 3x - 9$



b) x²+ 3x + 4,3x² - x +2

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Answer 1

(1)

$(3 {x}^{3} - 2 {x}^{2} + 4x + 5) - ( {x}^{3} + {x}^{2} - 3x - 9) \\ \\ = > 3 {x}^{3} - 2 {x}^{2} + 4x + 5 - {x}^{3} - {x}^{2} + 3x + 9 \\ \\ = > 3 {x}^{3} - {x}^{3} - 2 {x}^{2} - {x}^{2} + 4x + 3x + 5 + 9 \\ \\ = > 2 {x}^{3} - 3 {x}^{2} + 7x + 14$

(2)

$({x}^{2} + 3x + 4) - (3 {x}^{2} - x + 2) \\ \\ = > {x}^{2} + 3x + 4 - 3 {x}^{2} + x - 2 \\ \\ = > {x}^{2} - 3 {x}^{2} +3 x + x + 4 - 2 \\ \\ = > - 2 {x}^{2} + 4x + 2$

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Answer 2

XD

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