it is because the X means times and the other x means a mystery number.
example 2 X x = 78
the answer can be anything unless you really study the number until u find out what number it is it helps if u do this:
8
2 2
x this x is 8 because the opposite one is 8
but this only helps if u r learning about shapes
-4
If x is a real number then, depending on the value of x, any value greater than or equal to -112. Factored, that becomes 7(x +4)(x - 4)
Four times a number x equals 4x.
19.5 x 4
0
4 x 20 = 80
21.5 x 4 = 86
625 x 4 = 2500
x = ¼x^4 + 4x + k where k can be any number
The additive inverse of a real number is the number that when added to it equals zero, the identity element for addition. That is, the additive inverse of any real number x is -x.
A complex number is denoted by Z=X+iY, where X is the real part and iY is the imanginary part. So the number 4 would be 4+i0 and is the real part of a complex number and so 4 by itself is just a real number, not complex.
(x^2)^(1/2) equals x, therefore, y = x+4, which has a range and domain of all real numbers. The graph is a straight line, slope of 1, y-intercept of 4. Are you actually saying y = (x^2+4)^(1/2). If so, the range and domain will also be all real numbers because x^2+4 will never result in a negative number.