Question

If x square+1 by x square =27 find the value of x+1byx

Answer 1

Answer:

±5

Step-by-step explanation:

just expand, rearrange n substitute,!

(x−1x)2

=x2−2⋅x⋅1x+(1x)2

=x2−2+(1x)2

=x2+1x2−2

since we have the value of

x2+1x2as 27 ,

=27−2=25

⇒(x−1x)2=25

⇒x−1x

=±5