Question

If a= 7- 4 √3 then find the value of a + 1/a

Answer 1

Answer:

Refer the picture for the answer

INSTA :@ALFA_THE_LEKHAK

YOUTUBE :ALFA THE LEKHAK

Answer 2

7 -4√3

1/a = 1/( 7 -4√3) = (7-4√3)/(7-4√3)(7+4√3)

=(7+4√3)/(49-48) = (7+4√3)

so, √a = √( 7 -4√3)

= √(2²+√3²-2.2√3)

=√(2 -√3)² = ( 2 -√3)

same way ,

1/√a = √(2² +√3² +2.2√3)

=√(2+√3)²

=(2 +√3)

now ,

√a + 1/√a = (2 -√3) + (2 + √3)=4