Question

${x }^{2} - x - 12 = 0$

Answer 1

x^2 - x - 12 = 0
a= 1; b = -1; c = -12
/\= b^2 -4ac
/\= (-1)^2 -4.1.(-12)
/\= 1+48
/\= 49
x= (-b +/- V/\ )/ 2a
x= [-(-1) +/- 7 / 2.1
x'= [1+7]/2
x'= 8/2
x'= 4
x" = [1-7]/2
x" -6/2
x" = - 3
Resp.: (- 3; 4)