Math correct
posted by Bryan .
Subtract..
(8x^4+5x^36)(2x^22x+6)
I got 8x^4+5x2x^2+2x12
convert the number to scientific notation.
19,450,000,000
I got 1.945x10^10

your first answer is right except the second term which should be 5x^3.
And writing in scientific notation, when moving decimal to left, exponent is negative, so correct answer will be 1.945*10^10 
I am sorry, your scientific notation is correct. When moving decimal to left exponent is positive.

1.945x10^10
or
1.945*10^10 
1.945*10^10
or
1.945x10^10 
1.945*10^10
or
1.945x10^10
and 8x^4+5x^32x^2+2x12
is this correct? 
yes.

1.945*10^10 and yes your polynomial is correct.