The discriminant for the quadratic is b2-4ac = 302 - 4*4*45 = 900 - 720 = 180
Since 180 is not a perfect square, the roots of the equation are irrational and it is far from straightforward to solve such an equation by factoring.
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2(5x - 1)(3x - 2)
15x2 - 30x -720 = 15(x - 8)(x + 6).
-30x=6.3 x=-.21
x = 0.666666666666667 so 100 + (30x0.67) + (30x0.67) = around 180
For the equation: x5+7x3-30x=0 The highest exponent in the entire equation is 5 (from x5), so the equation is of degree 5.