25x^2+320x+399 factorise by middle term splitting
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25x^2+320x+399=0
25x^2+285x+35x+399=0
5x(5x+57)+7(5x+57)=0
(5x+57)(5x+7)=0
5x+57=0
5x+7=0
x=-57÷5 and x=-7÷5.
25x^2+285x+35x+399=0
5x(5x+57)+7(5x+57)=0
(5x+57)(5x+7)=0
5x+57=0
5x+7=0
x=-57÷5 and x=-7÷5.
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