Il faut conjecturer le tableau de variation de f(x) : 2x+12+450/x
f'(x) = 2 -450/x² = (2x² - 450)/x²
x -15 0 15
f'(x) + 0 - | - 0 +
f(x) / -48 \ | \ 72 /
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f'(x) = 2 -450/x² = (2x² - 450)/x²
x -15 0 15
f'(x) + 0 - | - 0 +
f(x) / -48 \ | \ 72 /