Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
2*x*(2*x+10)-4*x^2+40 == 0
⇒ algebra.equations.quadratic.same-con-factorx*(2*x+10)-2*x^2+20 == 0
⇒ algebra.equations.linear.distr-times2*x^2+10*x-2*x^2+20 == 0
⇒ algebra.equations.quadratic.same-con-factorx^2+5*x-x^2+10 == 0
⇒ algebra.equations.linear.merge5*x+10 == 0
⇒ algebra.equations.coverup.onevar.plus5*x == -10
⇒ algebra.equations.coverup.timesx == -2