Define a kind of operation with *: for rational number a, B, there is a * B = A & # 178; + ab. if (- 3) * x = 15, then the value of X is ()

Define a kind of operation with *: for rational number a, B, there is a * B = A & # 178; + ab. if (- 3) * x = 15, then the value of X is ()

a※b=a² +ab
So (- 3) * x = 9-3X = 15
-3x=6
x=-2