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Question
Factorise completely: 3x2 + 15x - 72
Sum
Solution
3x2 + 15x - 72 = 3 (x2 + 5x - 24)
= 3[x2 + 8x - 3x - 24]
= 3[x (x + 8) - 3 (x + 8)]
= 3[(x + 8)(x - 3)]
= 3 (x + 8)(x - 3)
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Factorising Completely
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