Question

Select the two values of x that are roots of this equation.
x2 + 3x - 3 = 0

Answer 1

A.
`\bold {x=(-3+√(21))/(2)}` and D.
`\bold {x=(-3-√(21))/(2)}`

Explanation:

`x^2 + 3x - 3 = 0\\a=1\,,\ \ b=3\,,\ \ c=-3\\\\x=(-b\pm√(b^2-4ac))/(2a)\\\\x=(-3\pm√(3^2-4\cdot1\cdot(-3)))/(2\cdot1)=(-3\pm√(9+12))/(2)=(-3\pm√(21))/(2)`