Use the distributive property to multiply.

-10 (3x-6y+4)

-30x+60y-40

(-) (-) it's positive

(+) (-) it's negative

Remember that when you distribute, you multiply the outside number (-10) to all of the inside number separately (3x, - 6y, and 4)

So while distributing, the expression is equivalent to (-10) 3x + (-10) - 6y + (-10) 4

This equals - 30x + 60y - 40

Tell me if this answer doesn't make sense.