Question

1.The increasing interval(s) of y=x^2+4x-2 are?
2.The decreasing interval(s) of y=x^2+4x-2 are?
3.The decreasing intervals of y=x^3+2x-1 are?

Answer 1

1.(-2,infinity)
2.(-infinity,-2)
3.it's increases from -infinity to infinity and therefore no decreasing interval