Select the quadratic that has roots x=8 and x=-5 a x^2 + 3x -40 b x^2-3x-40 c x^2 + 13x +40 dx^2-13x+40

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a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.