Question

prove that √2+√7 is an irrational number​

Answer 1

Answer:

hi

Step-by-step explanation:

Suppose (sqrt(2) + sqrt(7)) is not irrational but rational number and equal to r. Then ,

[math] [/math]sqrt(2) + sqrt(7) = r [math]==>[/math] sqrt(2) = r - sqrt(7) ==> 2 = r^(2 ) + 7 - 2r sqrt(7) or

sqrt(7) = (r^(2) + 5)/2r . But r.h.s. here is a rational number while l.h.s. is an irrational number, a contradiction .

Answer 2

Answer:

oh,,dry actually only in 7 class ....