f(x) = 2x^4-8x²+5x-7
x=3

[tex]{ \pink{ \boxed{ \purple{ \sf{f(3) = 98}}}}}[/tex]Step-by-step explanation:[tex]{ \blue{ \tt{f(x) = 2 {x}^{4} - 8 {x}^{2} + 5x - 7}}}[/tex][tex]{ \blue{ \tt{f(3) = 2( {3})^{4} - 8( {3})^{2} + 5(3) - 7}}}[/tex][tex]{ \blue{ \tt{f(3) = 2(81) - 8(9) + 15 - 7}}}[/tex][tex]{ \blue{ \tt{f(3) = 162 - 72 + 8}}}[/tex][tex]{ \blue{ \tt{f(3) = 162 - 64}}}[/tex][tex]{ \red{ \boxed{ \green{ \sf{f(3) = 98}}}}}[/tex]