Not a great deal. Multiply it by itself and divide by 4. If x is imaginary, x2 is negative.
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A quadratic expression in the variable x.
2x2 - x - 15 = 0(2x + 5) (x - 3) = 0[2x + 5 = 0] and [x - 3 = 0]x = -5/2 and x = 3{-2.5, 3}
3x^2 + x + 2x^2 = 5x^2 + x
2x^8 x 3x^2 x -4x = -24x^11
2x