To compute \((-3.2 \times 10^{-7}) \times (-8.6 \times 10^{-9})\), you multiply the coefficients and add the exponents of the powers of ten.
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Multiply the coefficients: \[ -3.2 \times -8.6 = 27.52 \] (The negatives cancel out.)
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Add the exponents: \[ -7 + (-9) = -16 \]
Now combine the results: \[ 27.52 \times 10^{-16} \]
To express this in scientific notation: \[ 2.752 \times 10^{-15} \]
So, the final result is: \[ \mathbf{2.752 \times 10^{-15}} \]