Question

х квадрат-8х+15=0 помагите

Answer 1

$x^2-8x+15=0\ D=64-4*1*15=4\ x_{1,2}=frac{8pm2}{2}=3;5$

Answer 2

x^2-8x+15=0

D=(-8)^2-4*15=64-60=4; sqrt(D)=2; x1=8+2/2=5; x2=8-2/2=3;