найдите корни уравнений: 4 x^2+9x-9=0, 7х^2-3х-4=0, х^2+3х=17=0, 5х^2+4х+5=0 пом...

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найдите корни уравнений: 4 x^2+9x-9=0, 7х^2-3х-4=0, х^2+3х=17=0, 5х^2+4х+5=0 помогите НА СЕГОДНЯ НАДО

Gerren 4x^2+9x-9=0
D=9^2-4*4*(-9)=81+144=225 √D=15 x1=(-9+15)/2*4=6/8=3/4 x2=(-9-15)/8=-24/8=-3
7x^2-3x-4=0 D=(-3)^2-4*7*(-4)=9+112=121 √D=11 x1=(3+11)/2*7=14/14=1 x2=(3-11)/14=-8/14=-4\7

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