Engineering Board Exam Reviewer · Inverse Trigonometric Functions · hard

EE Board March 1998: Solve for x in the equation: (x+1) + (x-1) = (12).

1. 1.5
2. 1.34
3. 1.20
4. 1.25

Answer

B. 1.34

Solution

(x+1)+(x-1)/1-(x+1)(x-1)=12 2x/2-x2=12 6x2+x-12=0. Solving gives x= -1+sqrt(289)12= 43 1.34.

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