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