The domain of the function y = in (x + 1) / √ - X & sup2; - 3x + 4 is

The domain of the function y = in (x + 1) / √ - X & sup2; - 3x + 4 is

Logarithmically significant, x + 1 > 0, x > - 1
The radical has meaning and is the denominator, which is not equal to 0
-x^2-3x+4>0
x^2+3x-4

Finding the definition field of y = 3x-1 function

That's it? The domain is the range of x value, so x belongs to R

How to explain by physics that the density of ice is smaller than that of water!
3Q

Calculate by formula
M=PV
So. P = m / v
Because the mass of water remains unchanged after freezing
And the volume gets bigger [that's common sense. You should know you're hungry after drinking frozen mineral water], that is, the V gets bigger
The mass does not change. The volume becomes larger, so the density becomes smaller
So the density of ice is less than that of water!

Why is the expression of force defined as F = ma, that is, f = MS / T ^ 2
If the definition is changed to f = MS / T or F = MV / T ^ 3, what will happen? (where s and T are instantaneous variables)

This expression is based on Newton's second law, that is, the acceleration of an object is directly proportional to the force, inversely proportional to the mass of the object, and directly proportional to the reciprocal of the mass of the object

Logarithmic function to solve equation or inequality
（1）2x(5^1-x)-9=0
（2）logx 1/2=-1/2
（3）log1/2 (x+2)>-3
.>0

（1）2[5^（1-X）]=9
5^（1-X）=9/2
1-X=log5（9/2）
X=1-log5（9/2）
（2）logX（1/2）
=-logX（2）
Then logx (2) = 1 / 2
2=X^（1/2）
X=4
（3）log1/2（X+2）>-3=log1/2（8）
Then x + 2

How to calculate 25 × 44 + 75 × 56 simply?

25 × 44 + 75 × 56
=25*44+25*3*56
=25*4*11+25*4*14*3
=100*(11+14*3)
=100*53
=5300

If you want the expression to be true when the value of a is odd and false when the value of a is even
A%2 = = 1
!(A%2 = = 0)
!(A%2)
A%2

! (a% 2) this is not satisfied

16. 32, 43, 46, 54, 69, 63, 81, 21, 56, which are multiples of 3? Based on what do you judge?

54 69 63 81 21 is a multiple of 3
Add up the numbers in each digit of the number, and the number is a multiple of 3, then the number is a multiple of 3

Simple calculation of 0.26 × 4.8 + 1.3 × 1.04

(0.26+1.04)×(4.8+1.3)=7.93

Y = 4 (x-1) square-3 is equal to the square of 4x-8x + 1?

y=4(x-1)²-3
=4(x²-2x+1)-3
=4x²-8x+4-3
=4x²-8x+1