Hello everyone

I have to integrate the definite integral square root(x) using the trapezoidal rule

n=8

from x=4 to x=9

I did (9-4)/8

giving me a width of 5/8

then I did

((9-4))/((2n)) giving me 5/16

I did

(4)^(1/2)+2(4.625)^(1/2)+2(5.25)^(1/2)+2(5.875)^(1/2)+ 2(6.5)^(1/2)+(7.125)^(1/2)+2(7.75)^(1/2)+2(8.375)^(1/2)+1(9)^(1/2) times ((5/16))

But what could be wrong?