New operator definitions 2

The operations $\oslash $ and $\bigtriangleup $ are defined as follows: - $x \oslash y = x^{2}+3y^{2}$ - $x \bigtriangleup y = 4x-4$ **Find $3 \bigtriangleup (-2 \oslash 6)$.** [[☃ numeric-input 1]]