simplify. : using
![(a + b) \: (a - b) \: = (ab) {?}^{2} (a + b) \: (a - b) \: = (ab) {?}^{2}](https://tex.z-dn.net/?f=%28a++%2B+b%29++%5C%3A++%28a+-+b%29+%5C%3A++%3D+%28ab%29+%7B%3F%7D%5E%7B2%7D+)
(6x + 3y)^2 + (6x-3y )^2
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no I don't think I should have been here
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