p(x) = 6(x² + 2) + 13
To find p(15) you have to replace x = 15 into the equation, as follows:
p(15) = 6(15² + 2) + 13
p(15) = 6(225 + 2) + 13
p(15) = 6(227) + 13
p(15) = 1362 + 13
p(15) = 1375
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