How do you simplify #-4(5c+7)-3c+13#?

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Answer 1 · 2016-06-09T15:31:51

#-4(5c+7)-3c+13" "=" " -23c-15#

Multiply everything inside the brackets by negative 4.

Remember that positive times negative = negative
Same for negative times positive = negative

Consider:
#(-4)xx5 = -20" so "(-4)xx5c = -20c#

#(-4)xx7=-28#
'.....................................................

So we now have:

#-20c-28-3c+13#
'..........................................................

Consider
#-20c-3c=-23c#
#-28+13 = -15#
'...........................................................

So we now have:

#-23c-15#