The mark scheme andmy answer. well....... 18 + 1 = 4 x^4 x^2
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Originally Posted by Dominic O'L The mark scheme andmy answer. well....... 18 + 1 = 4 x^4 x^2 Multiply both sides by $\displaystyle x^4$: $\displaystyle 18 + x^2 = 4x^4$. Re-arrange: $\displaystyle 4x^4 - x^2 - 18 = 0$. Factorise: $\displaystyle (x^2 + 2) (4x^2 - 9) = 0$. Solve for x:
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