It is useful when dealing with very small or very large numbers.
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It would have been helpful if you had actually given "this" equation. But since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
It is too long to write in standard form and more susceptible to typing errors.
The answer will depend on a standard US WHAT! But since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
Standard form: 1.34*101 or, more simply, 1.34*10Expanded form: 10 + 3 + 0.4
The standard form, which is the form that can be generalised to 3 or more dimensional spaces, is 4x + 5y - 13 = 0