solve the following quadratic equation of factorization,complete square and quadratic formula method x^2-18x+77
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×^2-18×+77
×^2-(11+7)×+77
×^2-11×-7×+77
×(×-11)-7(×-11)
(×-7)(×-11)
×=7
×=11
×^2-(11+7)×+77
×^2-11×-7×+77
×(×-11)-7(×-11)
(×-7)(×-11)
×=7
×=11
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