Question

1)(3x-1)(x+2)=20
2) (x-4)(4x-3)+3=0
3)(x-3)^2+(x+4)^2-(x-5)^2=17x+24
4)(x+5)^2+(x-2)^2+(x-7)(x+7)=11x+80 помогите плизз

Answer 1

1. 3x^2+5x-22=0 D=17^2 x1=11/3 x2=2 => 3(x-11/3)(x-2)=0
2. 4x^2-19x+15=0 D=11^2  x1=1  x2= 15/4 => 4(x-1)(x-15/4)=0
3. x^2-5x-24=0  D=11^2 x1=-3  x2=8 => (x+3)(x-8)=0
4. 3x^2-5x-100=0 D=35^2  x1=-5 x2=20/3  => 3(x+5)(x-20/3) =0