Question

Which of the following is the correct expansion of (3x-y)2

Answer 1

`\bold{[ \ Answer \ ]}`

`\boxed{\bold{9x^(2) \ - \ 6xy \ + y^(2) }}`

`\bold{[ \ Explanation \ ]}`

• 
  `\bold{Find \ Expansion: \ (3x \ - \ y^(2) )}`

`\bold{----------------------}`

• 
  `\bold{[Apply \ Perfect \ Square \ Formula\ (\left(a-b\right)^2=a^2-2ab+b^2)] \ a \ = \ 3x, \ b \ = \ y}`

`\bold{\left(3x\right)^2-2\cdot \:3xy+y^2}`

• 
  `\bold{[Simplify \ \left(3x\right)^2-2\cdot \:3xy+y^2] \ 9x^2-6xy+y^2}`

=
`\bold{9x^2-6xy+y^2}`

`\boxed{\bold{[] \ Eclipsed \ []}}`