Factorise : i) 4(y^2 - 1)^2 -15(y^2 -1) -4
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let (y^2 - 1) = x
===========================
4x^2 - 15x - 4
4x^2 - (16 - 1)x - 4
4x^2 - 16x + x - 4
4x(x - 4) + ( x - 4)
(x - 4) (4x + 1)
(y^2 - 1 - 4)(4y^2 - 4 + 1)
(y^2 - 5)(4y^2 - 3)
i hope this will help you
(-:
===========================
4x^2 - 15x - 4
4x^2 - (16 - 1)x - 4
4x^2 - 16x + x - 4
4x(x - 4) + ( x - 4)
(x - 4) (4x + 1)
(y^2 - 1 - 4)(4y^2 - 4 + 1)
(y^2 - 5)(4y^2 - 3)
i hope this will help you
(-:
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