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When –3 is multiplied by the sum of a number and 8, the result is –21. Find the number. A. 3 B. –1 C. 8 D. –2
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When –3 is multiplied by the sum of a number and 8, the result is –21. Find the number.

A.
3
B.
–1
C.
8
D.
–2

User SQiShER
by
8.7k points

1 Answer

4 votes
-3 times (x+8)=-21
-3(x+8)=-21
distributive property=a(b+c)=ab+ac
-3(x+8)=-3x+(-3)(8)=-3x-24
-3x-24=-21
add 3x to both sides
-24=-21+3x
add 21 to both sides
-3=3x
divide both sids by 3
-1=x

x=-1
User Nicola Peluchetti
by
8.1k points
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