To find the missing exponent in the equation \( h450h? = h215 \), we can rewrite it in a more manageable form:
Let us denote \( h450 \) as \( h^{450} \) and \( h? \) as \( h^x \), where \( x \) is the missing exponent we need to find.
We have:
\[ h^{450} \cdot h^{x} = h^{215} \]
By using the property of exponents which states that \( h^a \cdot h^b = h^{a + b} \), the equation can be simplified to:
\[ h^{450 + x} = h^{215} \]
Since the bases (h) are the same, we can equate the exponents:
\[ 450 + x = 215 \]
Now, we can solve for \( x \):
\[ x = 215 - 450 \] \[ x = -235 \]
Therefore, the missing exponent is \(-235\).