Question

The equation x^2 = d has how many real solutions when d > 0?

Answer 1

Explanation:

This is a quadratic equation. All quadratic equations have two solutions. In this case, with d > 0, the two solutions / roots are real, one positive and one negative. To see this, take the square root of both sides of x² = d.

Answer 2

2 real solutions

Explanation:

d>0: two real solutions

D=0 one real solution

D<0: two complex (imaginary) solutions