Problem

9.7 Linear and Other Relationships CA-251 2. The rocket scientists determined that another equation for the height of the rocket is \[ h=2304-16(t-10)^{2} \] a. Describe the structure of the expression on the right side of the equal sign. b. Reason about the structure of $2304-16(t-10)^{2}$ to determine the largest value it can have and to determine the value of $t$ at which this occurs. To help your thinking, consider these questions: -Why can $16(t-10)^{2}$ never be negative? - How can you use the structure of $16(t-10)^{2}$ to determine for which value of $t$ it is 0 ? c. Why would the rocket scientists want to know the largest value of the expression? Copyright $\odot 2022$ Pearson Education, Inc.

Solution

Step 1 :First, we understand the structure of the expression on the right side of the equation. It is a quadratic equation in the form of \(a(t-h)^2 + k\), where \(a = -16\), \(h = 10\), and \(k = 2304\). This form represents a parabola that opens downwards because \(a\) is negative.

Step 2 :We know that \(16(t-10)^2\) can never be negative because it is a square of a real number and the square of any real number is always non-negative.

Step 3 :The largest value of the expression \(2304-16(t-10)^2\) occurs when \(16(t-10)^2 = 0\), because subtracting anything from 2304 will make it smaller. And \(16(t-10)^2 = 0\) when \(t = 10\).

Step 4 :So, the largest value of the expression \(2304-16(t-10)^2\) is \(2304\) and it occurs when \(t = 10\).

Step 5 :The rocket scientists would want to know the largest value of the expression because it represents the maximum height the rocket can reach.

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