How to solve x (square) + 4x-12 = 0

How to solve x (square) + 4x-12 = 0

(X-2) (x + 6) = 0, so it's equal to two or minus six

The solution of x ^ 2-4x-12 = 0

X^2-4X-12=0
(X+2)(X-6)=0
X = - 2 or x = 6
It has two roots, X1 = - 2, X2 = 6

How to solve 4x + 3 (X-8) = 60

4x+3(x-8)=60
4x+3x-24=60
7x=84
x=12

Look at the diagram and find the solution of the equation. Three X's on the right, one X's on the left and 100

1x+100=3x
（3-1）x=100
2x=100
x=50

Original price: X Yuan. Discount: 60% off. Current price: 1200 yuan

Suppose the original price is x yuan
x×60%=1200
x=2000

Take a look at the diagram and find the solution of the equation. 2x + 50 = 200

2x=150
x=75

1/2 ,7/9 ,13/16 ,19/23 ,5/6 ,（ ）
31/37
11/12
33/37
10/11

31 / 37 because 2-1 = 1; 9-7 = 2; 16-13 = 3; 23-19 = 4; 5 / 6 becomes 25 / 30, 30-25 = 5
So 37-31 = 6, this is the answer

Judge whether equation x2-x-1 = 0 and equation x4-3x-2 = 0 have common solution, and explain the reason
X2 is the second power of X, X4 is the fourth power of X

First solve the problem of two times, and then replace it with four times

How to solve the equation "x + X + (55 -- x) = 55"?
The question is this: there are 55 coins of 1 cent, 2 cents and 5 cents, which are worth 1 yuan. If the number of 1 cent is the same as that of 2 cents, how many coins are there?
How to solve the equation?

1 yuan = 100 points
Suppose that 1.2 points have X and 5 points have y
Then 2x + y = 55
X+2X+5Y=100
Combine the two equations
Then x = 25. Y = 5
So there are 25 1.2 pennies. There are five 5 pennies
According to the title, it is so
That equation and the problem are completely different
I don't know if it's wrong or what
If we solve that equation. X can only be zero

How to solve (x-4) X4 = 3x-4

4x-16=3x-4
x=12