Posted by Ulises on .
x^35x^2+4x20 > 0 interval notation

College Algebra 
Reiny,
factor by grouping
x^2(x5) + 4(x5) > 0
(x5)(x^2+ 4) > 0
x^2 + 4 is always positive, so for the whole thing to be positive
x5 > 0
x > 5
express it in the form you were taught.