Finding the satisfaction unknown x The second power of (x + 3) = 16

Finding the satisfaction unknown x The second power of (x + 3) = 16

The second power of (x + 3) = 16
x+3=±4
x=±4-3；
That is: X1 = 1;
x2=-7；

x. Y is two rational numbers. "13 of the sum of X and Y equals 4" is expressed as ()
A. X + y + 13 = 4B. X + 13y = 4C. 13 (x + y) = 4D

"13 of the sum of X and Y equals 4" is expressed as 13 (x + y) = 4

If the square - 2x - 1 = 0 of the quadratic equation x is changed into the form of square = n of (x m), then n is equal to

x²-2x-1=
x²-2x+1=2
(x-1)²=2
n=2

First find the law, then find the value of X. (9,3) = 12, (7,5) = 4, (10,3) = 14, (2 / 3,1 / 4) = 5 / 6, calculate: (1 / 2, x) = 2 / 5

（9-3）*2=12
（7-5）*2=4
（10-3）*2=14
（2/3-1/4）*2=5/6
（1/2-x）*2=2/5
x=3/10

How to shift terms in solving linear equation of one variable

This is relatively simple
X+3=0
X = 0-3
3X=6
Move to x = 6 divided by 3

In the sixth order determinant, what symbol should be preceded by the product of the following elements?
（1） a21 a53 a16 a42 a65 a34
(2) a61 a52 a43 a34 a25 a16

(1) A 21 a 53 a 16 a 42 a 65 a 34 = a 16 a 21 a 34 a 42 a 53 a 65 column is arranged as: 61 4 235 inverse ordinal number = 1 + 1 + 2 + 2 + 1 = 7 odd number, so the front is negative sign. (2) a 61 A 52 a 43 a 34 a 35 a 15 a 16 a 25 a 34 a 43 a 52 a 61 column is arranged as: 65 4 321 inverse ordinal number = 1 + 2 + 3 + 4 + 5 = 15 odd number

4x+8y=24；6x+4y=4,x=（ ）,y=（ ）

4X + 8y = 24; 6x + 4Y = 4, i.e
4x+8y=24 （1)
12x+8y=8 (2)
(2) - (1), got it
8x=-16
x=-2
Substituting (1), then
y=4
That is, x = - 2, y = 4

Given the points a (1,2), B (3, - 5) and P as a moving point on the x-axis, find the coordinates of point P when the absolute value of the distance difference between P and a, B is the maximum

Let B's symmetric point about X axis be B ′, connecting Pb ′, ab ′, then B ′ (3,5), Pb ′ = Pb, | pa-pb | = | pa-pb ′| ≤ ab ′, that is, when B ′, a and P are collinear, | pa-pb | is the largest. Let the analytic formula of the line ab ′ be y = KX + B, then 2 = K + B5 = 3K + B, and the solution of k = 32B = 12, | line ab ′

If the domain of F (square of x) is [- 1,2], then the domain of F (1-2x) is?

(-3,-1)

It is known that φ (x) = f (x) + G (x), where f (x) is the positive proportion function of X and G (x) is the inverse proportion function of X,
The analytic formula of φ (x) can be obtained when φ = (1 / 3) = 16 and φ (1) = 8
It's going to take concrete steps

Let f (x) = MX, G (x) = n / X
And the formula is: φ = (1 / 3) = 16 = f (1 / 3) + G (1 / 3) = m / 3 + 3N
φ(1)=8=f(1)+g(1)=m+n/3
Combine the above two algebraic expressions, solve the equation, get the value of M and N, then get the analytical expression