The quadratic equation whose roots are `+-`` ` i `sqrt(7)` ` ` . is
`x^2` + 7 = 0
`x^2`- 7 = 0
`x^2`+ x + 7 = 0
`x^2`- x - 7 = 0
give the steps for quadratic equation qhose are +-ieoot 7