x²+21x+104 middle term spliting
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= ×2 + 21x + 104 = 0
= x2 +13x + 8x + 104 = 0
= x(x + 13 ) + 8(x + 13 ) = 0
= x + 13 = 0, x + 8 = 0
= x = -13 , x = -8
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