Mathematics
Factorise :
3x2 + 15x - 72
Factorisation
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Answer
3x2 + 15x - 72
= 3(x2 + 5x - 24)
= 3(x2 + (8 - 3)x - 24)
= 3(x2 + 8x - 3x - 24)
= 3[(x2 + 8x) - (3x + 24)]
= 3[x(x + 8) - 3(x + 8)]
= 3(x + 8)(x - 3)
Hence,3x2 + 15x - 72 = 3(x + 8)(x - 3)
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