Chapter 8: Problem 17
Use the square root property to solve each equation. See Example 1. $$ x^{2}-35=0 $$
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Chapter 8: Problem 17
Use the square root property to solve each equation. See Example 1. $$ x^{2}-35=0 $$
These are the key concepts you need to understand to accurately answer the question.
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Use a graphing calculator to solve each equation. If an answer is not exact, round to the nearest hundredth. See Using Your Calculator: Solving Quadratic Equations Graphically. Fireworks. \(\quad\) A fireworks shell is shot straight up with an initial velocity of 120 feet per second. Its height \(s\) in feet after \(t\) seconds is approximated by the equation \(s=120 t-16 t^{2} .\) If the shell is designed to explode when it reaches its maximum height, how long after being fired, and at what height, will the fireworks appear in the sky?
An architect needs to determine the height \(h\) of the window shown in the illustration. The radius \(r,\) the width \(w,\) and the height \(h\) of the circular- shaped window are related by the formula \(r=\frac{4 h^{2}+w^{2}}{8 h} .\) If \(w\) is to be 34 inches and \(r\) is to be 18 inches, find \(h\) to the nearest tenth of an inch. (IMAGE CAN'T COPY)
On an exam, a student was asked to solve the equation \(-4 w^{2}-6 w-1=0 .\) Her first step was to multiply both sides of the equation by \(-1 .\) She then used the quadratic formula to solve \(4 w^{2}+6 w+1=0\) instead. Is this a valid approach? Explain.
Let \(f(x)=0.7 x^{2}-3.5 x .\) For what value(s) of \(x\) is \(f(x)=25 ?\)
Maximizing Revenue. When priced at \(\$ 30\) each, a toy has annual sales of \(4,000\) units. The manufacturer estimates that each S1 increase in price will decrease sales by 100 units. Find the unit price that will maximize total revenue. (Hint: Total revenue \(=\) price \(\cdot\) the number of units sold.)
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