Combine like terms to get equivalent expression:

0.5(x^4 - 3)+12
...inside parenthesis is x to the power of 4 minus 3.
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2 answers

0.5(x^4 - 3)+12
0.5 x^4 - 1.5 + 12
0.5 x^4 - 10.5
make that +10.5