Known x ^ 2 + y ^ 2 + 4x + 20-8y = 0 Given x ^ 2 + y ^ 2 + 4x + 20-8y = 0, find the value of Y —— x

Known x ^ 2 + y ^ 2 + 4x + 20-8y = 0 Given x ^ 2 + y ^ 2 + 4x + 20-8y = 0, find the value of Y —— x

x²+y²+4x-8y+20=0
x²+4x+4+y²-8y+16=0
(x+2)²+(y-4)²=0
x+2=0, y-4=0
x=-2, y=4

Given x ^ 2 + y ^ 2-4x-8y + 20 = 0, the value of logx (y ^ x) is

x^2+y^2-4x-8y+20=0
(x-2)^2+(y-4)^2=0
Because x, y are real numbers
So x = 2, y = 4
logx(y^x)=log2(16)=4

It is known that two of the equations 8x2 - (2M2 + M-6) x + 2m-1 = 0 are opposite to each other, then M=______ ．

Because the two equations are opposite to each other, 2M2 + M-6 = 0 (2m-3) (M + 2) = 0, M1 = 32, M2 = - 2. When m = 32, the original equation is: 8x2 + 2 = 0, at this time, the equation has no solution, M = 32 should be rounded off. When m = - 2, the original equation is: 8x2-5 = 0, △ 0, the equation has solution. So the answer is: - 2

A difficult mathematical calculation problem
4(x+5)(x+6)(x+10)(x+12)-3x^2=0

X equals 0

Seven out of ten tons is one out of two of () tons and one out of three out of four square meters

Seven out of ten tons is one out of two (seven out of five) tons
7 / 10 △ 1 / 2 = 7 / 5 ton
(1 / 4 square meter) is 1 / 3 of 3 / 4 square meter
3 / 4 × 1 / 3 = 1 / 4 square meter

When - 1 ≤ x ≤ 1, f (x) = ax + 2A + 1, what is the value range of a

The title is incomplete
The function value of F (x) = ax + 2A + 1 on [- 1,1] can be positive or negative, then the value range of a is
If a = 0, then f (x) = 1, does not satisfy the condition, so a is not equal to 0
Then f (x) is a linear function, which is either an increasing function or a decreasing function
If a > 0, f (x) increases monotonically
F (- 1) - 1 / 3 has no solution
If A0 is a > - 1 f (1)

How many square meters is 100 inches

1 foot = 10 inches, 1 thousand feet = 10 thousand inches, 1 square thousand feet = 100 square thousand inches, so 1 square thousand feet = 0.01 square thousand feet; 1 meter = 3 feet = 30 inches = 3 / 100 thousand inches, 1 thousand feet = 100 / 3 meters, 1 square thousand feet = 10000 / 9 square meters

What is the 201 power of (- 2) minus the 200 power of (- 2)?
I think so
200 power of (- 2) * (- 2 + 1)
=200 power of 2

(-2)^201 - (-2)^200
=(-2)*(-2)^200 - (-2)^200
=(-2)^200*(-2-1)
=(-3)*(-2)^200
= -3*2^200

For example, what is the slope k of a function after derivation

The function obtained by derivation is the derivative function, that is, the function formed by the slope of tangent of all points on the original function

What is the value of 456 * 55 + 457 * 45?
How can you quickly work out the answer to this question?
Also, this
426 * 187-423 * 24-423 * 63?

456*55+457*45
=456*55+（456+1）*45
=456*55+456*45+45
=456*（55+45）+45
=45600+45
=45645