Question

Could someone pls help me out ???

Answer 1

Option C.

Explanation:

`\sf\:x^(2)-3x+7=0`

Use the biquadratic formula.

`\sf\:\x=\frac{-\left(-3\right)(+/-)\sqrt{\left(-3\right)^(2)-4* 7}}{2}`

`\sf\:x=(-\left(-3\right)(+/-)√(9-4* 7))/(2)`

`\sf\:x=(-\left(-3\right)(+/-)√(9-28))/(2)`

`\sf\:x=(-\left(-3\right)(+/-)√(-19))/(2)`

`\sf\:x=(3(+/-)√(19))/(2)`

Positive sign:

`\boxed{\sf\:x=(3+√(19))/(2)}`

Negative sign:

`\boxed{\sf\:x=(3-√(19))/(2)}`

Hope it helps ⚜