いろいろな2次方程式

2x²+6x-8=0 x²+32x+14=0 (x-1)(x-3)=1 (2x+3)²+2(2x+3)-8=0 解説動画 ≫ x = 1,-4
x = -3±54
x = 2±2
x = -12,-72 2x²+6x-8=0
x²+3x-4=0
(x-1)(x+4)=0
x = 1,-4
x²+32x+14=0
4x²+6x+1=0
x =-6±6²-4×4×18
=-6±36-168
=-6±208
=-6±258
= -3±54
(x-1)(x-3)=1
x²-4x+3-1=0
x²-4x+2=0
x =-(-4)±(-4)²-4×1×22
=4±16-82
=4±82
=4±222
= 2±2
(2x+3)²+2(2x+3)-8=0 　2x+3=Aとおく
A²+2A-8=0
(A-2)(A+4)=0
(2x+3-2)(2x+3+4) =0
(2x+1)(2x+7)=0
x= -12,-72