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Find the Square of 9x – 7xy

User Talnicolas
by
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1 Answer

6 votes

Answer:


\huge \boxed{49x^2 y^2 -126x^2 y +81x^2}

Explanation:


\sf (9x - 7xy)^2

Expanding brackets.


\sf (9x - 7xy)(9x-7xy)

Applying the FOIL method.


\sf 9x(9x-7xy)-7xy(9x-7xy)


\sf 81x^2 -63x^2 y -63x^2 y+49x^2 y^2

Combining like terms.


\sf 81x^2 -126x^2 y+49x^2 y^2

User Rgareth
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