Simplify (8x^4 + 3x^3 - 7x + 9) - (4x^4 -2x^3 + 2x^2 - 10) show your work and explain the steps. leave your answer in standard form.

(8x^4 + 3x^3 - 7x + 9) - (4x^4 -2x^3 + 2x^2 - 10)

we can get rid of the first brackets because there is nothing in front of them, and the second set can be removed by multiplying all the terms inside by -1

8x^4 + 3x^3 - 7x + 9 - 4x^4 + 2x^3 - 2x^2 + 10
Now collect like terms 
8x^4 - 4x^4 + 3x^3 + 2x^3 - 2x^2 - 7x + 9  + 10
and simplify
4x^4 + 5x^3 -2x^2 -7x + 19

The name comes from the way that you round. Instead of rounding each number to a given place value, we round whatever number is in the front. ... You will need to round the number so that there is one digit in the front and all others become zeros.

Step-by-step explanation: