factorise 8x^4 + 14x^2 - 4
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Step-by-step explanation:
8x^4 + 14x^2 - 4
=2(4x^4+7x^2-2)
=2(4x^4+8x^2-x^2-2)
=2((4x^2(x^2+2)-1(x^2+2))
=2(4x^2-1)(x^2+2)
=2((2x)^2-1)(x^2+2)
=2(2x-1)(2x+1)(x^2+2)
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