Which of the following must be negative whenever x>y>0?

A) x^2 -4xy + y^2

B) x^2 -2xy – y^2

C) x^2 – xy -2y^2

D) y^2 -x^2 -xy

E) y^2 -x^2 +xy

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Posts Tagged: numbers and operations

# Which of the following must be negative whenever x>y>0?

# For an real number k, which of the following must be a real number?

# Which of the following statements is true for all real numbers c?

# If the sum of five integers is an even integer, what is the greatest number of these integers that can be odd?

# Are you a smooth operator? Prove it with this Numbers and Operations quiz.

Which of the following must be negative whenever x>y>0?

A) x^2 -4xy + y^2

B) x^2 -2xy – y^2

C) x^2 – xy -2y^2

D) y^2 -x^2 -xy

E) y^2 -x^2 +xy

For an real number k, which of the following must be a real number?

A)1/k

B)k/k+1

C)1/k-1

D) k/k^2+1

E) 1/k^2-1

Thank you

Which of the following statements is true for all real numbers c?

A) 8+c > 4+c

B) 8+ 4c > 4-4c

C) 4c > 8c

D) 8c > 4c

E) 8c^2 > 4c^2

If the sum of five integers is an even integer, what is the greatest number of these integers that can be odd?

A) Zero

B) One

C) Two

D) Four

E) Five

How’s everyone else doing on this quiz?