Simplify (3a^4-2a^2+5a-10) - (2a^4+4a^2+5a-2

3a4-2a2+5a-10) - (2a4+4a2+5a-2)

remove first set of parentheses:

apply "-" sign to second parentheses (distributive prop):

the - of a - becomes a +:

combine like terms:

Factor out the variables that are alike:

{ (1) a^4 + (-6) a^2 + 0a + (-8) }}}

0a is just 0, makea the "a" term go away:

can try to factor as squares, but it doesn't work out:

8 = (-4) x (+2) product factors cannot add to make 6.