Question 1

Which equations can this solve?

Accepted Answer

Linear (ax + b = 0), quadratic (ax^2 + bx + c = 0), and 2x2 linear systems. More forms may be supported on the page.

Question 2

How do I know if a quadratic has real roots?

Accepted Answer

Check the discriminant Delta = b^2 - 4ac. Delta > 0: two reals; Delta = 0: one real (double); Delta < 0: complex conjugates.

Question 3

Can I see steps?

Accepted Answer

Yes—expand, rearrange, and apply the formula with intermediate values (Delta, sqrt terms).

Question 4

What about fractions?

Accepted Answer

Inputs like 1/3 are parsed and simplified; results can be shown as fractions or decimals.

Question 5

Any pitfalls?

Accepted Answer

Watch for a = 0 in quadratic form (it becomes linear), and avoid dividing by zero in system coefficients.

Equation Solver Calculator — Linear & Quadratic Equation Solver