X^2-8x-5=0
x=-(-8)±√(-8)^2-4*1*(-5)/2*1
x=8±√64+20/2
x=8±√84/2
x=8±2√21/2
x=8+2√21/2
x=8-2√21/2
x=4+√21
x=4-√21
x1=4-√21,x2=4+√21
ответ: x1=4-√21
x2=4+√21
X^2-8x-5=0
x=-(-8)±√(-8)^2-4*1*(-5)/2*1
x=8±√64+20/2
x=8±√84/2
x=8±2√21/2
x=8+2√21/2
x=8-2√21/2
x=4+√21
x=4-√21
x1=4-√21,x2=4+√21
ответ: x1=4-√21
x2=4+√21