Which of the following represents the statement “the sum of the squares of x and y is equal to the square root of the difference of x and y”?
A. x2 + y2 =
B. x2 − y2 =
C. (x + y)2 =
D. = (x − y)2
Answer:A
Which of the following represents the statement “the sum of the squares of x and y is equal to the square root of the difference of x and y”?
A. x2 + y2 = B. x2 − y2 = C. (x + y)2 = D. = (x − y)2
Explanation: A Take it one phrase at a time. The “sum” means you will add two things. The “squares of x and y” means to square x and square y, or x2 and y2. Add these to get x2 + y2. Cross out any choice that does not have x2 + y2 as the first part of the equation. Only (A) is left.