Question

алгебра молю !!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

$7x^2-20x+14=0 \ D_1=100-98=2 \ x= frac{10pm sqrt{2} }{7}$

$y^2-10y-25=0 \ D_1=25+25=50 \ y= 5pm sqrt{50}$

$x^2-8x-84=0 \ D_1=16+84=100 \ x= 4+10 =14 \ x=4-10=-6$

$x^2+6x-27=0 \ D_1=9+27=36 \ x= -3-6=-9 \ x= -3+6=3$