1,3x^2 + 3,9x = 0 Can someone pls help me explain the steps for this, like how do I find the x1 and x2.

$30 to spend on dinner tax and gratuity at mos restaurant rax is 6% and they give a 15% tip on the total bill after taxes thier dinner cost $21 which statement correctly explains wether andrew and kate have enough money to pay their bill