(a-3)^2+(b-4)^2+(c-5)^2=0

So a-3=0 a=3

b-4=0 b=4 c-5=0 c=5

Triangle abc is a right triangle.

7. Multiply the numerator and denominator with the root number a+ the root number ab.

6. The square of x+1/x = x2+2+1/x2 = 8x2+1/x2 = 8-2 = 6.

(x-1/x) 2 = x2-2+1/x2 = 6-2 = 4x-1/x = radical number 4= plus or minus 2.