22.(2023春•宛城区校级月考)在等比数列{an}\{a_{n}\}{an}中,a3a_{3}a3,a7a_{7}a7是函数f(x)=13x3+4x2+4x−1f(x)=\frac{1}{3}{x^3}+4{x^2}+4x-1f(x)=31x3+4x2+4x−1的极值点,则a5=a_{5}=a5=___−2-2−2___.