RRB NTPC Elementary Algebra — practice questions — page 3

Explore 67 free Elementary Algebra questions in RRB NTPC Mathematics. Open each question or exercise to read its content, reference answers and available explanation.

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Elementary Algebra questions and exercises with answers

Showing questions 61–67 of 67.

RRB NTPC · Solve Linear EquationsRead the answer and worked solution →Solve for x: 3x - 7 = 14. What is the value of x?Read the answer and worked solution →If a + b = 10 and a - b = 4, what is the value of a?Read the answer and worked solution →Evaluate the quadratic expression 2x^2 + 5x - 4 when x = 3:Read the answer and worked solution →Expand and simplify the algebraic expression: (x + 3)(x - 3)Read the answer and worked solution →RRB NTPC · Solving Linear EquationsRead the answer and worked solution →RRB NTPC · Algebraic ExpansionsRead the answer and worked solution →

Worked practice questions

RRB NTPC · Solve Linear Equations

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Matching pairs

Left
2x + 4 = 10
Right
x = 3
Left
3x - 5 = 10
Right
x = 5
Left
5x + 2 = 22
Right
x = 4
Left
4x - 8 = 16
Right
x = 6

Instructions

Match each linear equation to its root x

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Solve for x: 3x - 7 = 14. What is the value of x?

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Correct answer: B. 7

3x = 14 + 7 = 21 => x = 21 / 3 = 7.

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If a + b = 10 and a - b = 4, what is the value of a?

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Correct answer: C. 7

Adding both equations: 2a = 14 => a = 7.

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