simple math questions!?

2x+3

sci not examples:
all numbers must be less than 10.
thats why there's a decimal.

9700= 9.7x10^3
0.0045= 4.5x10^-3

x + 1 + x + 2

2 x + 3

Scientific Notation
a x 10^n where 1 < a < 10 and n is an integer

Examples

235 = 2.35 x 10 ²

5687 = 5.687 x 10 ³

56948 = 5.6948 x 10^4

0.528 = 5.28 x 10^( - 1 )

0.00086 = 8.6 x 10^( - 4 )

scientific notation: 126 is not a scientific notation.
126 is scientific notation form is : 1.26 x 10^2
in scientific notation,
the number must be like a x 10^b,
when a is bigger or equals to 1, but is smaller than 10.

(x+1) + (x+2) = x + 1 + x + 2
= 2x + 3

(x + 1) + (x + 2)
= x + 1 + x + 2
= x + x + 1 + 2
= 2x + 3

Scientific Notation
Scientific notation, also known as standard form or as exponential notation, is a way of writing numbers that accommodates values too large or small to be conveniently written in standard decimal notation. Scientific notation has a number of useful properties and is often favored by scientists, mathematicians and engineers, who work with such numbers.
In scientific notation all numbers are written like this:

a x 10^b

2x+3.

There are 2 "x" and the addition sign in the middle indicates that it's just being added. There are no "-" signs in front of the two "x" so really "x+x=2x". Follow the same concept for the numbers. "1+2=3".

Scientific notation is just a handy-dandy way of shortening numbers. Say I have 1.3 x 10^5 (^ means to the power of, the number following would be a little number in superscript). The 5 means you have to move the decimal 5 places to the right (which works out to 130000). However, if it were 3.6 x 10^(-3), you would move the decimal 3 places to the left because it is a negative, which works out to 0.0036.

Just remember!
Negative= move decimal to the LEFT
Positive= move decimal to the RIGHT

Btw, using scientific notation, the number with the decimal must be a number smaller than 10.

2x+3
scientific notation is not applicable as x is a variable

scientific notation s a way of writing numbers that accommodates values too large or small to be conveniently written in standard decimal notation.