Question

If a²+b²= 45 and ab = 18 , find 1/a + 1/b.

Answer 1

Answer:1/a+1/b=1/2

Step-by-step explanation:

(A+b)^2=a^2+b^2+2(a*b)

(45)+2(18). As a^2+b^2=45

A*b=18

(A+b)^2=45+36=81

A+b=√81=9

(1/a)+(1/b)=(b+a)/(ab)

=9/18=1/2answer