Engineering Board Exam Reviewer · Exponents, Radicals, and Exponential Equations · hard

If a>0 and a2+a-2=7, find a+a-1.

1. 2.24
2. 3
3. 5
4. 9

Answer

B. 3

Solution

≤ft(a+a-1 )2=a2+2+a-2=7+2=9. Since a>0, a+a-1=3.

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