Question

If a^2+ 4b^2 = 5 and ab = 1, find the value of (a − 2b^2)​

Answer 1

Step-by-step explanation:

Given, a+2b=5, and ab=2.

Now,

a

2

+4b

2

=(a+2b)

2

−2.a.2b

=5

2

−4ab

=25−4×2 [ Using the given values]

=17.