x^(2)+9x+20

I. x^(2) + 20=9x II. y^(2)+42=13y

The number of real roots for the eqiuation x^(2) + 9 | x| + 20 = 0 is

9x^(2)-3x-20 solve for x

Find the roots of the quadratic equation 9x^(2)-3x-20=0 by formula method.

Find the roots of the given equation by splitting the middle term 9x^(2) - 3x - 20 = 0 .

Write P(x)=x^2-9 x+20 as a product of two first degree polynomials. Write also the solutions of the equation P(x) =0 .

Find the intervals in which the function f(x)=2x^(3) + 9x^2 + 12x + 20 is increasing