Question 549910
In this we just need to put x= -1/7 in the P(x)= {{{4x^4-2x^2+3}}}

so,
P(-1/7) = {{{ 4(-1/7)^4 -2(-1/7)^2 +3}}}
        = 4/2401 -2/49 +3
        = 4/2401 - 98/2401 + 7203/2401
        = 7109/2401 

this is the value of P(-1/7).