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Expression Formation

Question 5c S...

Question

Question 5(c)
Substract: $3 l (l - 4 m + 5 n) f r o m 4 l (10 n - 3 m + 2 l) .$

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Solution

$4 l (10 n - 3 m + 2 l) - 3 l (l - 4 m + 5 n) = 40 l n - 12 l m + 8 l^{2} - 3 l^{2} + 12 l m - 15 l n$
$= 8 l^{2} - 3 l^{2} - 12 l m + 12 l m + 40 l n - 15 l n$
$= 5 l^{2} + 25 l n$

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Q. Question 5(c)
Substract:

3 l (l - 4 m + 5 n) f r o m 4 l (10 n - 3 m + 2 l) .

3 l (l - 4 m + 5 n)

4 l (10 n - 3 m + 2 l)

p (p - q), q (q - r)

r (r - p)

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3 l (l - 4 m + 5 n)

4 l (10 n - 3 m + 2 l)

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(a)Add: $p (p - q), q (q - r)$ and $r (r - p)$

(b)Add: $2 x (z - x - y)$ and $2 y (z - y - x)$

(c)Subtract: $3 l (l - 4 m + 5 n)$ from $4 l (10 n - 3 m + 2 l)$

(d)Subtract: $3 a (a + b + c) - 2 b (a - b + c)$ from $4 c (- a + b + c)$

3 a (1 - 4 m + 5 n)

4 a (10 n - 3 m + 2 a)

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Expression Formation

Standard VII Mathematics

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