Please Help Me!
Simplify (2x^4+7x^3-3x+9)-(6x^4-3x^3-6x^2-17 ). Show your work and explain the steps. Leave your answer in standard form. If you do not explain the steps, you will not be getting credit for that step.

I know the answer to (2x^4+7x^3-3x+9)-(6x^4-3x^3-6x^2-17 ) , however, I don't know the steps to solving it.

Ahypothesis is: a the average squared deviations about the mean of a distribution of values b) an empirically testable statement that is an unproven supposition developed in order to explain phenomena a statement that asserts the status quo; that is, any change from what has been c) thought to be true is due to random sampling order da statement that is the opposite of the null hypothesis e) the error made by rejecting the null hypothesis when it is true