Which expression is equivalent to (xy−6)2(𝑥𝑦-6)2 for all values of x and y where the expression is defined? A. xy−36𝑥𝑦-36 B. xy36𝑥𝑦36 C. x2y−12𝑥2𝑦-12 D. x2y12
Question
Which expression is equivalent to (xy−6)2(𝑥𝑦-6)2 for all values of x and y where the expression is defined? A. xy−36𝑥𝑦-36 B. xy36𝑥𝑦36 C. x2y−12𝑥2𝑦-12 D. x2y12
Solution
The expression (xy−6)² is equivalent to x²y² - 12xy + 36.
This is obtained by squaring the binomial (xy - 6). The square of a binomial (a - b)² is given by a² - 2ab + b².
So, in this case, a is xy and b is 6.
Therefore, (xy - 6)² = (xy)² - 26xy + 6² = x²y² - 12xy + 36.
So, none of the options A, B, C, D is equivalent to (xy−6)².
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