Question

gs
$3x {}^{2} - 9x - 21 = 0$

Answer 1

3x^2 -9x-21=0

d=b^2 -4ac
d=(-9)^2-4*3*(-21)
d=37

x= -b+/- \/d/2.a

x1=3 +\/37/2
x2=3- \/37/2