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Finding the Value of an Expression

v Simplify th...

Question

Question 7 (v)

Simplify these expressions and find their values if x = 3, a = -1, b = -2:
2a - 2b - 4 - 5 + a

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Solution

2a - 2b - 4 - 5 + a = 2a + a - 2b - 4 - 5
= 3a - 2b - 9 = 3(-1) - 2(-2) - 9 [Putting a = -1, b = -2]
= -3 + 4 - 9 = -8

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Similar questions

Question 7 (i)

Simplify these expressions and find their values if
x = 3, a = -1, b = -2:
3x - 5 - x + 9

Question 7 (ii)

Simplify these expression and find their values if x = 3, a = -1, b = -2:
2 - 8x + 4x + 4

Question 7 (iv)

Simplify these expressions and find their values if x = 3, a = -1, b = -2:
10 - 3b - 4 - 5b

Question 7 (iii)

Simplify these expressions and find their values if
x = 3, a = -1, b = -2:
3a + 5 - 8a + 1

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

(i) 3x − 5 − x + 9 (ii) 2 − 8x + 4x + 4

(iii) 3a + 5 − 8a + 1 (iv) 10 − 3b − 4 − 5b

(v) 2a − 2b − 4 − 5 + a

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Finding the Value of an Expression

Standard VII Mathematics

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