9. Simplify:
2.
(i) 2x + 7x? -- 8x + 3x2 - 9x
(ii) x2 - xy + 3y2 - (2x2 + 4xy) - (-12x2 + 4y?)
(iii) a(a + b) - b(a - b) + 2ab
(iv) (5x + 5) - 3x(4y - 2) - 7x(x + 3)
(v) (2x + 3y)3y - (-3y + 4x)x
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= 4x2 - 2x + 5x2 + 8x.
= 4x2 + 5x2 - 2x + 8x.
= 9x2 + 6x.
= 3x(3x + 2).
Answer: 3x(3x + 2)
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