Factorize
3a⁴+18a²-21-2b-3b²​

What is the vertex form of f(x) = x2 + 6x + 3

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

Can some one explain this i got sent this. is this a threat i’m scared