Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Firsts
Rule quadraticequationstrategy.enter Location [] Term "Just (TCon relation1.eq [TNum 0,TCon arith1.plus [TCon arith1.times [TNum 7,TCon arith1.power [TVar \"x\",TNum 2]],TCon arith1.times [TNum 9,TVar \"x\"]]])" Focus "Just (TCon relation1.eq [TNum 0,TCon arith1.plus [TCon arith1.times [TNum 7,TCon arith1.power [TVar \"x\",TNum 2]],TCon arith1.times [TNum 9,TVar \"x\"]]])" Environment