Factorise :
x(6x - 5y) - 4(6x - 5y)2
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Given,
= (6x - 5y)[x - 4(6x - 5y)]
= (6x - 5y)(x - 24x + 20y)
= (6x - 5y)(20y - 23x).
Hence, x(6x - 5y) - 4(6x - 5y)2 = (6x - 5y)(20y - 23x).
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a2 + 4b2 - 3a + 6b - 4ab
m(x - 3y)2 + n(3y - x) + 5x - 15y
(x2 - 3x)(x2 - 3x - 1) - 20