Answer
$2NaBH_4 + H_2SO_4 --> B_2H_6 + 2H_2 + Na_2SO_4$
Work Step by Step
Recall that the number of each element must be equal on both sides of a chemical equation. Therefore, using guess and check, multiply compounds/atoms on each side of the equation by different numbers until the number of atoms on both sides of the equation is equal.