The Moment Jin Jin Touched Your Life—This Surprise Is Unbelievable

The Moment Jin Jin Touched Your Life—This Surprise Is Unbelievable
Have you ever

The Moment Jin Jin Touched Your Life—This Surprise Is Unbelievable
Have you ever
Here, \( a = 1, b = -4, c = -10 \)
\( t = \frac{4 \pm \sqrt{16 + 40}}{2} \)
\( t = \frac{4 \pm \sqrt{56}}{2} \)
\( t = \frac{4 \pm 2\sqrt{14}}{2} \)
\( t = 2 \pm \sqrt{14} \)
Only the positive root is meaningful: \( t = 2 + \sqrt{14} \approx 5.74 \) seconds
#### 5.74 seconds
A company’s profit \( P(x) \) in thousands of dollars is modeled by the function \( P(x) = -2x^2 + 40x - 150 \), where \( x \) is the number of units sold in hundreds. What is the maximum profit and how many units must be sold to achieve it?
The vertex form of a parabola \( ax^2 + bx + c \) reaches maximum at \( x = -\frac{b}{2a} \)
Here, \( a = -2, b = 40 \)