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Factorisation by Common Factors

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Question

Expand using appropriate formulae : (3x - 8)(3x+5)

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Solution

(3x - 8)(3x+5)

= 3x(3x+5) -8(3x+5)

= 3x.3x + 3x.5 -3x.8 - 5.8

= 9x²+ 15x - 24x - 40

= 9x²- 9x - 40 Ans.

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