Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

2 == 1/4*(17-x^2)

⇒ algebra.equations.coverup.times

8 == 17-x^2

⇒ algebra.equations.coverup.onevar.minus-right

9 == x^2

⇒ algebra.equations.coverup.power

3 == x or -3 == x

⇒ algebra.equations.linear.flip

x == 3 or -3 == x

⇒ algebra.equations.linear.flip

x == 3 or x == -3