Formula
Subtract B and divide by A:
x = (C − B) / A
The linear-equation page instead evaluates y = mx + b at an x you choose. The quadratic page solves a squared term.
Assumptions
- A is not zero.
- The equation has one unknown.
Worked example
2x + 3 = 11 gives x = 4.
Input definitions
- A
- The coefficient of x.
- B and C
- The constant on the left and the value on the right.
Limitations
Results are rounded for display. This is a classroom calculation, not a measurement from a lab or a financial filing.
Questions
What if A is zero?
There is no x term, so the form asks for another A.
Can I solve a square?
Use the quadratic formula calculator.