I was finishing a 50 problem packet and these problems took me a long time to figure out however I got them wrong, can any one help me on them?
15.* 4 + x4
16.* 1 + a2 + a4
21. 3a2 + 1 - 3a – a3
19.* - x4 - 4a4
7.* x4 + 4 y4
Are we expected to assume that 3a has a different meaning to a3? Are we meant to assume that by a3 you mean a^3 etc.
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