Question

if a-1/a =5 then find a^2+1/a^2​

Answer 1

$(x-y)^2=x^2+y^2-2xy\\\\a-\frac{1}{a}=5\\\\Squaring\;on \;both\;sides\\\\(a-\frac{1}{a})^2=25\\\\a^2+\frac{1}{a^2}-2=25\\\\a^2-\frac{1}{a^2}=27$

hope it helps

Answer 2

this is the answer. hope it helps