5 + (10 x 2) + 8 ÷ 4 + 1 = 28
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10x2 +4x + 21 = 0=> 4*x +10*x^2 +21 = 0Complex roots:Root 1: -0.2-1.435 * iRoot 2: -0.2+1.435 * i
(5x - 4)(2x + 7)
(5x - 4)(2x + 3)
x3 - 10x2 + 24x = x(x2 - 10x + 24) = x(x - 6)(x - 4).
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