# What does "-2E-07x" means? [duplicate]

I'm a programmer who had always been lacking some mathematical skills, yes it's a shame, I know.

I'm making this little software for a biologist friend, and at some point I need to pull out a graph out of a formulas he gave me.

Problem is, I don't understand it, and before asking him if there are no mistake in it (and possibly look like a fool), i thought I'd ask the community :)

So here is the formula :

y = -2E-07x6 + 1E-05x5 - 0.0002x4 + 0.0015x3 - 0.0052x2 + 0.0063x - 0.0007

• nEm is normally shorthand for $n10^m$ so -2E-07x6 is probably short hand for $(-2)10^{-7}x^6$. May 8, 2013 at 15:43
• guessing E means "exponent". also guessing the reason it's capitalized is because it fits conveniently into LCD displays on calculators
– amr
May 8, 2013 at 16:57

Just guessing: $$y = -2\cdot 10^{-7}\cdot x^6 + 10^{-5}\cdot x^5 - 2\cdot 10^{-4}\cdot x^4 + 1.5 \cdot 10^{-3}\cdot x^3 - 5.2\cdot 10^{-3}\cdot x^2 + 6.3\cdot 10^{-3}\cdot x - 4\cdot 10^{-4}$$ which is a simple polynom of degree 6.