3x^2 + 13x - 10 = 0
D = b^2 - 4ac = 13^2 + 4*10*3 = 289 = 17^2
x1 = ( - 13 + 17)/6 = 4/6 = 2/3
x2 = ( - 13 - 17)/6 = - 30/6 = - 5
A10=14,2+(-4.6*9)=14,2+(-41,4)=-27,2
S10=((14,2-27,2)/2)*10=-65
1)x/3=4 2)3-2x=5
x=4*3 -2x=5-3
x=12 -2x=2
x=2+2
x=4
12+4=16