we have
[tex]5+4*(8-6)^2[/tex]
we know that
Using PEMDAS- Parenthesis, Exponents, Multiplication, Division, Addition, and Subtraction
[tex]5+4*(8-6)^2[/tex] -------> Parenthesis
[tex]5+4*(2)^2[/tex] ------> Exponents
[tex]5+4*(4)[/tex] ------> Multiplication
[tex]5+16[/tex] ------> Addition
[tex]21[/tex]
therefore
the answer is
[tex]21[/tex]