Minimum value in 2 variables

Find the Minimum Value of:

$$\frac{18}{a+b}+\frac{12}{ab}+8a+5b.$$

where a and b are positive real numbers

I tried evaluating the expression into 1 denominator, and tried to get squares so i can evaluate to 0 but obviously it was the wrong approach.

Find the Minimum Value of:

$$\frac{18}{a+b}+\frac{12}{ab}+8a+5b.$$

where a and b are positive real numbers

I tried evaluating the expression into 1 denominator, and tried to get squares so i can evaluate to 0 but obviously it was the wrong approach.