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Simplify These Expressions and Find Their Values If X = 3, A = − 1, B = − 2. 3x - 5 - X + 9 - Mathematics

Simplify these expressions and find their values if x = 3, a = − 1, b = − 2.

3x - 5 - x + 9

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Solution

3x - 5 - x + 9 = 3x - x - 5 + 9

= 2x + 4 = (2 × 3) + 4 = 10

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APPEARS IN

NCERT Class 7 Maths
Chapter 12 Algebraic Expressions
Exercise 12.3 | Q 7.1 | Page 242
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