the diffrence is just nothing
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The difference between (9x10^10) and (4x10^10) in scientific notation is (5x10^10).
Squaring is a number raised to the power of two. Scientific notation is a number multiplied by 10 to the power of a number.
Significant figures is a way of trying to convey how accurately something is being measured. A very accurate scale may measure .001 grams, a bathroom scale may be only accurate to within 2 lbs. Exponential notation has nothing to do with measurement. It is just a choice on how to write a number, usually for some mathematical application. 243 = 35 this is exponential 'notation'. Scientific notation is a certain type of exponential notation in which the base must be 10. 243 = 2.43 x 102 that is scientific notation.
there is just an easier way of writing a large number in scientific notation by placing times 10 then a negative or positive exponent compared to a large number
Scientific notation (also called standard form or exponential notation) is a way of writing numbers that accommodates values too large or small to be conveniently written in standard decimal notation. Standard notation refers to expressing a number in its 'normal' form. For example, the standard notation of 150 is simply 150.