Can someone Explain how they got the part that is circled from the second deriva

Question

Can someone Explain how they got the part that is circled from the second derivative. I am having problems simplifying and cleaning up the problem to the ending result. When I try to simplifiy I get close to what is circled in red but I get a -4(x^2 - 1) squared instead of -4(x^2 -1)

Can someone Explain how they got the part that is circled from the second derivative. I am having problems simplifying and cleaning up the problem to the ending result. When I try to simplifiy I get close to what is circled in red but I get a -4(x^2 - 1) squared instead of -4(x^2 -1)

Explanation / Answer

They have taken (x^2 - 1) common from the numerator and denominator and cancelled it

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