Question

Find the Square of 9x – 7xy

Answer 1

`\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`