Question 7 (iii)

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

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Solution

3a + 5 - 8a + 1
= 3a - 8a + 5 + 1
= -5a + 6
= -5(-1) + 6 [Putting a = -1]
= 5 + 6 = 11

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Question 7 (i)

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

Question 7 (iv)

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

Question 7 (v)

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

Question 7 (ii)

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

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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