10th Maths - Book Back Answers - Chapter 3 Exercise 3.11 - English Medium Guides

  

 

SSLC / 10th - Maths - Book Back Answers - Chapter 3 Exercise 3.11 - English Medium

Tamil Nadu Board 10th Standard Maths - Chapter 3 Exercise 3.11: Book Back Answers and Solutions

    This post covers the book back answers and solutions for Chapter 3 Exercise 3.11 – Maths from the Tamil Nadu State Board 10th Standard textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.

    We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.

    By going through this material, you’ll gain a strong understanding of Chapter 3 Exercise 3.11 along with the corresponding book back questions and answers (PDF format).

Question Types Covered:

• 1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following 
• 2 Mark Questions: Answer briefly 
• 3, 4, and 5 Mark Questions: Answer in detail

All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.

All the best, Class 10 students! Prepare well and aim for top scores. Thank you!

Chapter 3 Algebra Ex 3.11

1. Solve the following quadratic equations by completing the square method
(i) 9x² – 12x + 4 = 0
Answer Key:
9x² – 12x + 4 = 0
${\mathrm{x}}^2-\frac{12\mathrm{x}}{9}+\frac{4}{9}$= 0 (Divided by 9)
${\mathrm{x}}^2-\frac{4\mathrm{x}}{3}=\frac{-4}{9}$
Add [$\frac{1}{2}$($\frac{4}{3}$)]² on both sides

The solution is$\frac{2}{3}$

 

(ii) $\frac{5x+7}{x-1}$ = 3x + 2
Answer Key:
(3x + 2) (x – 1) = 5x + 7
3x² – 3x + 2x – 2 = 5x + 7 ⇒ 3x² – x – 5x – 2 – 7 = 0

3x² – 6x – 9 = 0 ⇒ x² – 2x – 3 = 0 (divided by 3)
x² – 2x = 3
Adding ($\frac{1}{2}$ × 2)² on both sides
x² – 2x + 1 = 3 + 1
(x – 1)² = 4 ⇒ x – 1 = $\sqrt{4}$
x – 1 = ±2
x – 1 = 2 or x – 1 = -2
x = 3 or x = -1
The solution set is -1 and 3

  

2. Solve the following quadratic equations by formula method
(i) 2x² – 5x + 2 = 0
Answer Key:
a = 2, b = -5, c = 2

The solution set is 12 and 2

 

(ii) $\sqrt{2}$f² – 6 f + 3 $\sqrt{2}$ = 0
Answer Key:
Here a =$\sqrt{2}$, b = -6 and c = 3$\sqrt{2}$

The solution set is$\frac{3+\sqrt{3}}{\sqrt{2}}$and$\frac{3-\sqrt{3}}{\sqrt{2}}$

 

(iii) 3y² – 20y – 23 = 0
Answer Key:
a = 3, b = -20, c = -23

The solution set is -1 and $\frac{23}{3}$

 

(iv) 36y² – 12ay + (a² – b²) = 0
Answer Key:
Here a = 36, b = -12a, c = a² – b²

The solution set is $\frac{\mathrm{a}+\mathrm{b}}{6}$ and $\frac{\mathrm{a}-\mathrm{b}}{6}$

 

3. A ball rolls down a slope and travels a distance d = t² – 0.75t feet in t seconds. Find the time when the distance travelled by the ball is 11.25 feet.
Answer Key:
Distance = t² – 0.75t
11.25 = t² – 0.75t
Multiply by 100
1125 = 100t² – 75t
100t² – 75t – 1125 = 0 (Divided by 25)
4t² – 3t – 45 = 0
a = 4,
b = -3,
c = -45

(time will not be negative)
The required time = $\frac{15}{4}$ seconds
= 3 $\frac{3}{4}$ second or 3.75 seconds