Question

5(x^2+y^2)+4(x-y)
find its answer
x+y=8,xy=15/4​

Answer 1

Here's your Answer:

621/2

Step-by-step explanation:

( x - y )^2 = ( x + y )^2 - 4xy

= 8^2 - 4 * 15/4

= 64 - 15

( x - y )^2 = 49

x - y = 7 ---( 1 )

now,

= 5(x^2+y^2) + 4(x-y)

= 5[(x+y)^2 -2xy] + 4(x-y)

= 5 [(8^2) - (2 * 15/4)] + 4 * 7    (according to equation (3))

= 5 [ 64 - 15/2 ] + 28

= 5 * 113/2 + 28

= 565/2 + 28

= [565 + 56]/2

= 621/2

hope it helps you

please mark as brainliest

Answer 2

Pls mark as brainliest answer l I’ll l