Engineering Board Exam Reviewer · Logarithms · medium

Solve 3(x+2)+ 3(x-6)=2.

1. -3
2. 7
3. 3
4. 11

Answer

B. 7

Solution

3[(x+2)(x-6)]=2 (x+2)(x-6)=9 x2-4x-21=0 (x-7)(x+3)=0. Since x-6>0 requires x>6, only x=7 works.

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