3. f(x) = x + 3x4 – x3 - 3x2 + 5x + 15, g(x) = x + 3
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f. (x) = x + 3x4 – x3 - 3x2 + 5x + 15
=x=x+12-3x-6+5x+15
=x-x+3x+5x=12-6+15
=9x=21
=x=21
g. (x) = x + 3
=x-x=3
=x=3
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