If f(x)=3x5−10x3+5, on what intervals is f″(x)> 0?

enter the (disjoint) interval(s) below using 'u' for union, '"nf" for [infinity], and "-inf" for −[infinity] if necessary.

Step-by-step explanation:

we are given an algebraic function in x, such that

To find when second derivative >0

For this let us find first and second derivative by successive differentiation.

when ii derivative >0 we have

60x^3-30>0

f"(x)>0 in

a4 - 3a2 - 1

step-by-step explanation:

step   1   :

equation at the end of step   1   :

  ((a4) -   3a2) -   1

step   2   :

trying to factor by splitting the middle term

2.1     factoring   a4-3a2-1  

the first term is,   a4   its coefficient is   1 .

the middle term is,   -3a2   its coefficient is   -3 .

the last term, "the constant", is   -1  

an altitude of 15,000 feet

step-by-step explanation: