f(x) = 5x + 9x - x²
f(3) = ...
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f(3) = ...
-
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f(x) = 5x + 9x - x²
f(3) = 5(3) + 9(3) - 3²
f(3) = (5.3) + (9.3) - (3.3)
f(3) = 15 + 27 - 9
f(3) = 42 - 9
f(3) = 33
_______________
f(x) = 5x + 9x - x²
f(3) = 33
f(x) = 5x + 9x - x²
f(3) = 5(3) + 9(3) - 3²
= (5 × 3) + 9(3) - 3²
= 15 + (9 × 3) - 3²
= 15 + 27 - (3 × 3)
= 15 + 27 - 9
= 42 - 9
= 33