Find the value of 1+31−3+1−31+3\frac{1 + \sqrt{3}}{1 - \sqrt{3}} + \frac{1 - \sqrt{3}}{1 + \sqrt{3}} \\1−31+3+1+31−3
Question
Find the value of 1−31+3+1+31−3
A.
–4
B.
–2√3
C.
2√3
D.
4
Correct option is A
Solution:
1−31+3+1+31−3Step 1: Multiply both terms by the conjugate to simplify:=(1−3)(1+3)(1+3)2+(1+3)(1−3)(1−3)2=(1−3)(1+3)(1+3)2+(1−3)2=12−(3)2(12+2⋅1⋅3+(3)2)+(12−2⋅1⋅3+(3)2)=1−3(1+23+3)+(1−23+3)=−2(4+23)+(4−23)=−28=−4