(2x10 to fifth power) x (4 x 10 to the 4th power)

The answer that I received is 80,000,000.00 Is this correct?

Question

(2x10 to fifth power) x (4 x 10 to the 4th power)

The answer that I received is 80,000,000.00 Is this correct?

anonymous · Answer

not correct. decimal point should be removed and the 0's after kept :P


$$x^a * x^b = x^{a+b}$$

$$2 * 10^5 \times 4*10^4 = (2*4)\times 10^{5 + 4} = 8 * 10^9$$

chmvijay · Answer

noo it must be
8,000,000,000.00

anonymous · Answer

no it musn't.. @chmvijay  . only if it were 2.00e5 * 4.00e4

chmvijay · Answer

nope it can 8*10^9 =8*1000000000=8,000,000,000
or 2*10^5 =200000
and 4*10^4 =40000
=200000 * 40000 =8000,000,000
ur getting confusion with addition 
where it cantbe posbile

anonymous · Answer

9 decimal points, right?  I often get confused where to place the decimal.

chmvijay · Answer

after 9 you can place or not to place it never mint its like $=50 or $=50.00
it wont make much different