Question

we have to solve for D

Answer 1

Since in the original equation, there is √d, to isolate the variable, we must square both sides.

(√d)²= (4h)²
d= 16h^2

Final answer: d= 16h^2

Answer 2

$\sqrt{d} = 4h$ 

      $\text{Square both sides}$ 

$d=16h^2$