spliting the middle term of x square-18x+77
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=>x2-18x+77
=>x2+11x+7x+77
=>x(x+11)+7(x+11)
=>(x+11)(x+7)
=>x=-7,-11.
=>x2+11x+7x+77
=>x(x+11)+7(x+11)
=>(x+11)(x+7)
=>x=-7,-11.
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