Maths-
General
Easy

Question

If a2 + b2 = z and ab = y, which of the following is equivalent to 4z + 8y ?

  1. (a + 2b)2
  2. (2a +2b)2
  3. (4a + 4b)2
  4. (4a + 8b)2

The correct answer is: (2a +2b)2


    Solution:-
    • We have given equations
    a2 + b2 = z   --------- (1)
    ab = y        --------- (2)
    • We have to find the value of
    4z + 8y
    • We will put the values of z and y in 4z +8y
    4z + 8y = 4(a2 + b2)+ 8(xy)
    = 4a2 + 4b2+ 8xy
    • We can write 4a2 as (2a)2  as if we squared the term 2a we get 4a2.
    • Also, we can write 4b2 as (2b)2 as if we squared the term 2b we get 4b2.
    • So, we get
    4z + 8y = (2a)2 + (2b)2 + 8xy
    • On comparing the RHS with the formula u2+ v2 +2uv= (u + v)2,
    We get,    u = 2a , v = 2b , 2uv= 2(2a)(2b)
    Therefore, 4z + 8y = (2a + 2b)2
    • Therefore the correct answer is option(B) (2a + 2b)2.

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