Question

x^2+x-12 помогите решить

Answer 1

D=1+4*12=49 x1=(-1+7)/2=3 x2=(-1-7)/2=-4

Answer 2

D=b^2-4ab= 1-4*1(-12)= 49 (7^2)
X1,2=-b ⁺₋ √D2= x1=-1+72=3; x2=-1-72=-4