Question

4x²+12x+9=81解方程

Answer 1

解决以下公式：
（2）4个2 12 x 9 = 81

（2×3）^ 2 = 81

2×3 = 9大地

X1 = 6×2 = -12

（4）2×2 +3×= 3

X ^ 2 +3×/ 2 = 3/2

（倍3/4）^ 2 = 3 / 2 +9 / 16 =第33/16

x +3开始/ 4 =土壤√第33/4

X1 =（√33-3）/ 4×2 = - 。 （√33 +3）/ 4

（6）×（2X-5）= 4X-10

2X ^ 2-5X = 4X-10

2X ^ 2-9X +10 = 0

（X-2），（X-5）= 0

的x 2 = 0，X1 = 2

X-5 = 0，X2 = 5

（8）1 - 8X +16×2 = 2-8X

16X ^ 2 = 1 X ^ 2 = 1/16

X =土1/4
X1 = 1/4×2 = -1 / 4。

Answer 2

Answer 3

Answer 4

4X2+12X=72
X2+3X=18
(X-6)(X＋3)=0
X=6或X=-3

Answer 5