Using the formula,
⇒ Volume = Height × Length × Breadth
Substitute the values,
⇒ Volume = (h) × (7h) × (7h - 2)
Remove the brackets,
⇒ Volume = h × 7h × 7h - 2
Take variable and numbers seperately,
⇒ Volume = (h × 7h × 7h) - 2
Multiply and solve,
⇒ Volume = 49h - 2 cm³
∴ Thus, the volume of the rectangular box 49h - 2 cm3.