Question

21. Simplify.
i) 2x - 4y + 3x -7y + 5.
ii) (5x2 + 2x + 1) – (3x2 - 4x - 2) + 7x?​

Answer 1

Answer:

i) 5x -11y + 5

ii) 2x² + 13x + 3

Step-by-step explanation:

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Answer 2

Answer:

$1) \: 2x - 4y + 3x - 7y + 5 \\ \\ = 2x + 3x - 4y - 7y + 5 \\ \\ = 5x - 11y + 5$

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

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