Question

РЕШИТЕ ПОЖАЛУЙСТА  x^{2} +7X+6=0 /.       x^{2} +6 x +9=0        .x^{2}+3x-54=0            . x^{2} +11 x +24=0.     x^{2} + x =56 .     x^{2} - {x} =2.      .  x^{2} -4 x=5    . x^{2} +8 x^=-12.. x^{2} +4 x^=-7

Answer 1

$x^{2}+7x+6=0 \ d=7^{2}-4*1*6=25\ x_{1}= frac{-7+sqrt{25}}{2}=-1,x_{2}=frac{-7-sqrt{25}}{2}=-6 \ \ x^{2}+6x+9=0 \d=6^{2}-4*1*9=0\ x_{1}= frac{-6+sqrt{0}}{2}=-3,x_{2}=frac{-6-sqrt{0}}{2}=-3 \ \ x^{2}+3x-54=0 \ d=7^{2}-4*1*6=25\ x_{1}= frac{-7+sqrt{25}}{2}=-1,x_{2}=frac{-7-sqrt{25}}{2}=-6$

$x^{2}+11x+24=0 \ d=11^{2}-4*1*24=121-96=25\ x_{1}= frac{-11+sqrt{25}}{2}=-3,x_{2}=frac{-11-sqrt{25}}{2}=-8 \ \ x^{2}+x-56=0 \d=1^{2}-4*1*(-56)=1+224=225=15^{2}\ x_{1}= frac{-1+sqrt{225}}{2}=7,x_{2}=frac{-1-sqrt{225}}{2}=-8 \ \ x^{2}-x-2=0 \ d=(-1)^{2}-4*1*(-2)=9\ x_{1}= frac{1+sqrt{9}}{2}=2,x_{2}=frac{1-sqrt{9}}{2}=-1$

$x^{2}-4x-5=0 \ d=(-4)^{2}-4*1*(-5)=36\ x_{1}= frac{4+sqrt{36}}{2}=5,x_{2}=frac{4-sqrt{36}}{2}=-1 \ \ x^{2}+8x+12=0 \d=8^{2}-4*1*12=64-48=16\ x_{1}= frac{-8+sqrt{16}}{2}=-2,x_{2}=frac{-8-sqrt{16}}{2}=-6 \ \ x^{2}+4x+7=0 \ d=4^{2}-4*1*7=16-28<0$
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