2x-6 = 16 solution equation

2x-6 = 16 solution equation

2x-6=16
2x=6+16
2x=22
x=11
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First find the law, then calculate 1 + 2 + 3 + 4 + 5 + 6 = () x (), what is the number multiplied by?

1+6=7
2+5=7
3+4=7
3×7

Term shifting for solving linear equation of one variable
When I solve the equation of one variable, I can solve the equation, but if I ask some application questions to make the equation, I won't make the equation. What should I do?

Application questions should pay attention to the following points
What do you need to ask for? Set the requirement to the unknown number X
List the equations in X according to the meaning of the title
Solve the unknowns
Answer
Of course, practice makes perfect. Do more exercises and ask the teacher
Hope to help you.

Is the sign of the product of sub diagonal elements in determinant necessarily negative?

Not necessarily. The sub diagonal element of determinant expansion is
(-1)^t(n,n-1,n-2...1)a1i1a2i2a3i3...anin
T (n, n-1, n-2,... 1) is a reverse number
=n(n-1)/2
as
t(4,3,2,1)=3+2+1=6
When the reverse number is even, the sub diagonal is positive
Negative when odd
When n (n-1) is an integral multiple of 4, the sub diagonal element is positive
as
Order 4, 5, 12, etc

The quadratic power of x plus 4xy plus the quadratic power of 4Y minus 4x minus 8y plus 4

The quadratic power of x plus 4xy plus the quadratic power of 4Y minus 4x minus 8y plus 4
=x²+4xy+4y²-4y-8y+4
=(x+2y)²-4(x+2y)+4
=(x+2y-2)²

The distance between the coordinate P and the X axis is the absolute value of Y, and the distance from the Y axis is the absolute value of X. why

Let the coordinates of p be (x, y), then the coordinates of projection a of P on the Y axis are (0, y), and the coordinates of projection B on the X axis are (x, 0), then the length of PA is the distance from P to y axis, which is the absolute value of X; the length of Pb is the distance from P to X axis, which is the absolute value of Y

Find the definition field of function f (x) = 2 ^ √ (1-x ^ 2) + √ (2x ^ 2 + 5x-3)

Find the definition field of function f (x) = 2 ^ √ (1-x ^ 2) + √ (2x ^ 2 + 5x-3)
1-x²≥0;
x²≤1;
-1≤x≤1;
2x²+5x-3≥0;
(2x-1)(x+3)≥0;
X ≥ 1 / 2 or X ≤ - 3;
∴1/2≤x≤1
I'm very glad to answer your questions. Skyhunter 002 will answer your questions
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The length of the line segment of the image of the quadratic function y = - (x + 1) (X-2) on the x-axis is___ ．

When y = 0, - (x + 1) (X-2) = 0, the solution is X1 = - 1, X2 = 2, | x1-x2 | = 3. Therefore, the length of the line segment is 3

The number on the top of a six digit number is 1. If you move the number to the right of a six digit number, the number you get is three times the original number
The number on the top of a six digit number is 1. If you move the number to the right of a six digit number, then the number you get is three times the original number. Who will solve the problem

Let the last five digits of the original number be X
(100000+x)×3=10x+1
x=42857
The original number is 142857

Using factorization calculation: 1-22 + 32-42 + 52-62 + +992-1002+1012．

1-22+32-42+52-62+… +992-1002+1012=1+32-22+52-42+… +1012-1002=1+（3+2）（3-2）+（5+4）（5-4）+… +（101+100）（101-100）=1+（3+2）+（5+4）+… +（101+100）=(1+101)×1012=5151．