Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

-(3+2*x)^2+3*x^2-11 == 0

⇒ algebra.equations.quadratic.distr-square

-9-12*x-4*x^2+3*x^2-11 == 0

⇒ algebra.equations.linear.merge

-20-12*x-x^2 == 0

⇒ algebra.equations.quadratic.nice-factors

(x+2)*(x+10) == 0

⇒ algebra.equations.quadratic.product-zero

x == -2 or x == -10