It is (x + y)^3 - sqrt(5x + 3y) and there is no sensible simplification of this expression.
Twice the sum of 'x' and 'y' . . . 2(x+y) The sum of twice 'x' and 'y' . . . (2x+y)
It can be, it need not be.
2(x+y) is twice the sum of x and y, and 2x+y is the sum of twice x and y
The sum of x and y decreased by their product is (x + y)- xy.
x+y
X+y
Resultant is equal to the square root of the sum of the summation of x-components and the summation of y-components
5(x^2 + y)
Suppose the numbers are x and y. The sum of their reciprocals = 1/x + 1/y = y/xy + x/xy = (y+x)/xy = (x+y)/xy = 10/30 = 1/3
x=y
Suppose the two numbers are x and y. Then, the sum of THEIR reciprocals is 1/x + 1/y = y/xy + x/xy = (y + x)/xy = 7/25