Question

if 2x+3y=8 and xy = -1 then find the value of 4x ka power 2 + 49y ka power 2

Answer 1

2X+ 3Y = 8 ---(1)

XY = -1 , here value of X is either X= 1 or -1 ,and Y is either "1" or -1 .

so check these values in eqn.(1)

here the value of X is "1 "

so from (1) Y= (8 - 2 ) / 3

Y = 2

now , 4X^2 + 49Y^2

= 4(1)^2 + 49 ( 2)^2

= 4 + 196

= 200 ans.

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