Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
52 == x^2+3
⇒ algebra.equations.coverup.onevar.plus49 == x^2
⇒ algebra.equations.coverup.power7 == x or -7 == x
⇒ algebra.equations.linear.flipx == 7 or -7 == x
⇒ algebra.equations.linear.flipx == 7 or x == -7