Question

X^4 - 3x^2 - 10 = 0 using the u

Answer 1

`x ^ { 4 } - 3 x ^ { 2 } - 10 = 0\\Let, t = x^(2) \\\rightarrow \: t^(2)-3t-10=0 \\\\\\t=\frac{-\left(-3\right)(+/-)\sqrt{\left(-3\right)^(2)-4* 1\left(-10\right)}}{2} \\t=(3(+/-)7)/(2) \\\\So,\\t = 5 \: and \: -2\\\\Then,\\x = √(5) \: and \: -√(5)`

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