1. 2-9x^2=02. -15-2x^2=-11x3. -0,36-x^2=04. 16x+64=-x^25. 13x+3x^2=-146. 7x^2-3x=07. 5=2x-x^28. 16+x^2=8x9. 1-4x^2+3x=010. -12x+4=-9x^211. 10x^2-2=x

1)2-9x^2=0 9x^2=2 x^2=2/9 x1=sqr2/3 x2=-sqr2/3 2)-15-2x^2=-11x -2x^2+11x-15=0 d=121-4(-2)(-15)=121-120=1 x1=(-11-1)/2=-6 x2=(-11+1)/2=-5 3)-0.36-x^2=0 (-1)x^2=0,36 x^2=-0,36 такого быть не может. 4) 16x+64=-x^2 x^2+16x+64=0 d=256-4*1*64=256-256=0 x=-16/2=-8 5) 13x+3x^2=-14 3x^2+13x+14=0 d=169-4*3*14=169-168=1 x1=(-13-1)/6=-14/6=-7/3 x2=(-13+1)/6=-12/6=-2 6) 7x^2-3x=0 x(7x-3)=0 x1=0 x2=7x-3=0 x2=3/7 7)5=2x-x^2 x^2-2x+5=0 d=4-4*5=4-20  d<0 корней нет 8)16+x^2=8x x^2-8x+16=0 d=64-4*16=64-64=0 x=8/2=4 9)1-4x^2+3x=0 -4x^2+3x+1=0 d=9-4*(-4)=9+16=25=5^2 x1=(-3+5)/(-8)=-1/4 x2=(-3-5)/(-8)=1 10) -12x+4=-9x^2 9x^2-12x+4=0 d=144-4*9*4=144-144=0 x=12/18=4/6=2/3 11) 10x^2-2=x 10x^2-x-2=0 d=1-4*10*(-2)=1+80=81=9^2 x1=(1-9)/20=-8/20=-4/10=-2/5 x2=(1+9)/20=10/20=1/2