5x+4x^2
if we factor the expression:
“take the common factor out of brackets
x*(5+4x)
if you find the roots of a polynomial:
5x+4x^2
f(x)= 5x+4x^2
f(x)=0
5x+4x^2=0
let's find the roots using the discriminant formula
a=5, b=4, c=0
D=b^2-4ac => 16-4*5*0 = 16, D>0
x1,2= -b±√D/2a => -4±4/10 = 0; -4/5 (or -1,25)
-4/5 (-1,25);0