Question:medium
If $y = 8x^3 - 60x^2 + 144x + 27$ is a strictly decreasing function in the interval:
If $y = 8x^3 - 60x^2 + 144x + 27$ is a strictly decreasing function in the interval:
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For a parabola $ax^2+bx+c$ with $a>0$, the values are negative between the roots. This "Wavy Curve" method allows you to instantly identify the decreasing interval once you find the factors $(x-2)(x-3)$.
Updated On: May 2, 2026
- $(-5, 6)$
- $(-\infty, 2)$
- $(5, 6)$
- $(3, \infty)$
- $(2, 3)$
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The Correct Option is
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