Answer:
4
Step-by-step explanation:
Simplify x and y by rationalising the denominator of both
To rationalise the denominator multiply the numerator/ denominator by the conjugate of the denominator.
The conjugate of 2 + is 2 -
The conjugate of 2 - is 2 +
x = =
= 2 -
y = =
= 2 +
Thus
x + y = 2 - + 2 +
= 4
Answer:
The correct options are 1,2 and 3.
Step by step explanation:
According to the definition of function there exist unique value of y for each value of x in the domain of the function.
If equation have more than one values of y for any value of x, then the equation is not a function.
.... (1)
... (2)
A quadratic equation have two values of x and the value of y can be any number. So a quadratic equation is not a function.
The first and second equations are quadratic equations so the equation (1) and (2) are not functions.
The third equation is
The degree of y is 2. It means for each value of x there exist two values of y.
Put x=0, then we get
More than one values of y exist for single value of x.
So the equation (3) is not a function.
The fourth equation is
Since the degree of x is 1 and degree of y is also 1, therefore it is a linear equation and for each value of x there exist a unique value of y.
Therefore the equation (4) is a function.