To find the missing exponent in the equation \( h^{450} h^? = h^{215} \), we can use the laws of exponents. When multiplying like bases, we can add the exponents:
\[ h^{450} \cdot h^? = h^{450 + ?} \]
This means we can set up the equation:
\[ h^{450 + ?} = h^{215} \]
Since the bases (h) are the same, we can equate the exponents:
\[ 450 + ? = 215 \]
To solve for \( ? \), we subtract 450 from both sides:
\[ ? = 215 - 450 \] \[ ? = -235 \]
Therefore, the missing exponent is \(-235\).