Question

85 . ( -51) + 34 . (-51) - 19 . (-51)

Answer 1

\(85\left(-51\right)+34\left(-51\right)-19\left(-51\right)\)

\(=\left(-51\right)\left(85+34-19\right)\)

\(=-51\cdot100=-5100\)

Answer 2

    \(85\cdot\left(-51\right)+34\cdot\left(-51\right)-19\cdot\left(-51\right)\)
⇔\(\left[-51\right]\left(85+34-19\right)\)
=  \(\left[-51\right]\cdot100\)
\(=-5100\)