Question

X–Y=4,XY=3 find the value of X+Y????​

Answer 1

Step-by-step explanation:

X-Y=4

so X=Y+4

XY=3

so (Y+4) Y= 3

Y²+4Y=3

Y²+4Y-3=0

By quadratic formula, Y = -1, -3

So X+Y = (Y+4)+Y

= 2(Y+2)

=2(-1+2) = 2(-3+2)

= 2 = 2(-1)

=-2

Hence answer is ±2

Answer 2

Answer:

3 OR 1

Step-by-step explanation:

x - y = 4

∴ x = 4 + y ............ (i)

xy = 3

So, (y + 4)y = 3

y² + 4y = 3

y² + 4y - 3 = 0

∴ y = -1 , -3

x = 4 + (-1)

x = 3

∴ x + y = 4 + (-1)

= 3

         OR

x + y = 4 + (-3)

= 1

Hope it Helps!!

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