<span>c^2+6c+5=0
c1+c2=-6 U c1*c2=5
c1=-5
c2=-1</span>
3-3=0+3=3 5-5=0+5=5 5+3 =8
1)(b-1)(3a-2c+d)
2)(r-s)(7c+5k+3n)
3)(a+b+c)(s-t+k)
4)(m+n+k)(4z+5y-7x)
<span>x+3y=4</span>
<span>x^2-xy=8</span>
<span>x+3y=4</span>
y=(-x+4)/3
x^2-xy=8
x^2-x*((-x+4)/3)=8
4/3x^2-4/3x-8=0
D=(-4/3)^2-4*4/3*(-8)=400/9
x1=(20/3-(-4/3))/(2*4/3)=3
x2=(-20/3-(-4/3))/(2*4/3)=-2
x+3y=4
3+3y=4
y1=1/3
(-2)+3y=4
y2=2