a. Explanation Given information: A function is given as, f ( x ) = x 2 + 2 x − 21 . Three lines are given as, y = 3 x − 25 y = 6 x − 25 and y = 9 x − 25 Calculation: Three lines are given as, y = 3 x − 25 ... eq(i) y = 6 x − 25 ... eq(ii) and y = 9 x − 25 ... eq(iii) Given function is, f ( x ) = x 2 + 2 x − 21 . Let us suppose, y = f ( x ) = x 2 + 2 x − 21 ....eq(iv) If the line y = 3 x − 25 passes through the graph of function f ( x ) , then upon solving eq(i) and eq(iv) will give the point of intersection. Substituting y = 3 x − 25 in eq(iv), y = x 2 + 2 x − 21 ⇒ 3 x − 25 = x 2 + 2 x − 21 ⇒ x 2 − x + 4 = 0 Here, b 2 − 4 a c = ( − 1 ) 2 − 4 ⋅ 1 ⋅ 4 = − 15 < 0 { From properties of quadratic equation } No real solution of above quadratic equation . Therefore, no point of intersection will be there . Again, if the line y = 6 x − 25 passes through the graph of function f ( x ) , then upon solving eq(ii) and eq(iv) will give the point of intersection. Substituting y = 6 x − 25 in eq(iv), y = x 2 + 2 x − 21 ⇒ 6 x − 25 = x 2 + 2 x − 21 ⇒ x 2 − 4 x + 4 = 0 ⇒ ( x − 2 ) 2 = 0 ⇒ x − 2 = 0 ⇒ x = 2 From eq(ii), y = 6 x − 25 ⇒ y = 6 ( 2 ) − 25 = − 13 Therefore, one point of intersection will be ( 2 , − 13 ) b. To determine The sketch of function f and three given lines. c. To determine The relationship between graph of f and the lines y = c x − 25 as c changes from 0 to ∞ .

4th Edition

ISBN: 9781319050733

Author: Rogawski

Publisher: MAC HIGHER

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Question

Chapter 1.2, Problem 51E

To determine

If the lines y=3x−25,y=6x−25, and y=9x−25 intersect the graph of f in zero, one, and two points respectively.

To determine

The sketch of function f and three given lines.

To determine

The relationship between graph of f and the lines y=cx−25 as c changes from 0 to ∞ .

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Chapter 1.2, Problem 50E

Chapter 1.2, Problem 52E

Chapter 1 Solutions

CALCULUS (CLOTH)

Ch. 1.1 - Prob. 1PQ Ch. 1.1 - Prob. 2PQ Ch. 1.1 - Prob. 3PQ Ch. 1.1 - Prob. 4PQ Ch. 1.1 - Prob. 5PQ Ch. 1.1 - Prob. 6PQ Ch. 1.1 - Prob. 7PQ Ch. 1.1 - Prob. 8PQ Ch. 1.1 - Prob. 9PQ Ch. 1.1 - Prob. 10PQ

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If the lines y = 3 x − 25 , y = 6 x − 25 , and y = 9 x − 25 intersect the graph of f in zero, one, and two points respectively.

Solution Summary: The author explains the function f(x)=x2+2x-21.

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If the lines y=3x−25,y=6x−25, and y=9x−25 intersect the graph of f in zero, one, and two points respectively.

The sketch of function f and three given lines.

The relationship between graph of f and the lines y=cx−25 as c changes from 0 to ∞ .

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Chapter 1 Solutions