factorise 2x Cube + 7 x square - 9
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I think there should be 2 square instead of 2 cube.
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skps2447:
No in question there is 2 cube
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13
2x³ + 7x² - 9
= 2x³ - 2x² + 9x² - 9
= 2x³ - 2x² + 9x² - 9x + 9x - 9
= 2x²(x-1)+9x(x-1)+9(x-1)
= (2x²+9x+9)(x-1).
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