Can someone please help me with this binary operation 10POINTS TO YOU

The binary operation * is defined by a * b = ( a + b )^2 - 2ab
Calculate the value of ( 3 * 4 ) *2

N.B could u please use "BY" when u mean 'what' multiply by 'what'

10 POINTS IN AN HOUR

( 3 * 4 ) *2
= (49 - 24) * 2
= 25 * 2
= (729 - 100)
= 629