3a4 - 2a2 + 5a - 10 - 2a4 + 4a2 + 5a - 2 = a4 + 2a2 + 10a - 12 = a4 + (2a - 2)(a + 6)
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2a + 3a + 4 = 5a + 4
9
Without further information, all we can do is simplify: 4c + 4d = 4(c + d)
9x + 91 is already simplified because there is nothing that is on the other side of the "equals" sign.
3a * * * * * Actually, it is 4a.