To simplify the expression \((-8b)(-15b)\), you can follow these steps:
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Multiply the coefficients: \(-8 \times -15 = 120\) (since the product of two negative numbers is positive).
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Multiply the variable parts: \(b \times b = b^2\).
Putting it all together, we get: \[ (-8b)(-15b) = 120b^2 \]
Thus, the simplified expression is \(120b^2\).
So, the answer is: 120b².