Question

15) Factorise: 4x4 - 5x² +1
Sol:
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Answer 1

$4 {x}^{4} - 5 {x}^{2} + 1 \\ 4 {x}^{4} - {x}^{2} - 4 {x}^{2} + 1 \\ {x}^{2} (4 {x}^{2} - 1) - 1(4 {x}^{2} - 1) \\ ( {x}^{2} - 1)(4 {x}^{2} - 1) \\ (x + 1)(x - 1)(2 {x}^{ } + 1)(2x - 1)$