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f(x) = 3x^3 – x^2 – 20x – 12 (a) Use the factor theorem to show that (3x + 2) is a factor of f(x). [2 marks] (b) Factorise f(x) fully. [3 marks]

(a) Factor theorem hence, use x = -2/3. Sub in : 3(-2/3)³ - (-2/3)² -20 (-2/3) -12 = 0 (b) (3x+2)(ax² + bx+c) = 3x³ – x² – 20x – 12 3ax³

Answered by Daniel W. • Further Mathematics tutor

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1294 Views

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How to study Philosophy without having to memorise

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Answered by Joyal T. • Biology tutor

2333 Views