Find the value of expression:
3a - 4b - 8 + 5a + 2b, if a = 3 and b = 7.
2

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Solution

The correct option is A 2
Simplify the expression: $3 a - 4 b - 8 + 5 a + 2 b$
$= (3 a + 5 a) + (- 4 b + 2 b) - 8$
$= 8 a - 2 b - 8$

Substituting $a = 3$ and $b = 7$ in the above expression,

$8 a - 2 b - 8$
$= 8 \times 3 - 2 \times 7 - 8$
$= 24 - 14 - 8$
$= 24 - 22$
$= 2$

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Similar questions

Find the value of: $3 a - 2 b$ $w h e n a = 8, b = 10$

2 a - [3 a + 4 b - (2 a - b) + 5 a - 7 b]

3 a - 2 b, w h e n a = 8, b = 10

\frac{5 a + 2 b}{5 a - 2 b} = \frac{5}{3}

:

= 2 : 5

(3 a + 4 b) : (5 a + 6 b)

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