Find the value of:
$2 p - 3 q + 4 r - 8 s when p = 10, q = 8, r = 6 and s = 2$ .

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Solution

Step: Finding the value of: $2 p - 3 q + 4 r - 8 s$
On substituting $p = 10, q = 8, r = 6 and s = 2 in 2 p - 3 q + 4 r - 8 s$ ,
we get
$2 p - 3 q + 4 r - 8 s = (2 \times 10) - (3 \times 8) + (4 \times 6) - (8 \times 2)$
$= 20 - 24 + 24 - 16$
$= 20 - 16$
$= 4$
Therefore, the value of $2 p - 3 q + 4 r - 8 s is 4$ .

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2 p - 3 q + 4 r - 8 s

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