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Multiply: (-3d+(-7f)]b y\ (5d+f)...

Multiply: `(-3d+(-7f)]b y\ (5d+f)`

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` (- 3d - 7f) × (5d + f)`
`=-3d (5d + f) - 7f (5d + f)`
`=-15d^2 – 3df - 35df - 7f^2`
`=-15d^2 - 38df - 7f^2`
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