Question 83 (ix)

Multiply the following:
(p + 6), (q - 7)

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Solution

We have, (p + 6) and (q - 7)
$∴ (p + 6) \times (q - 7) = p (q - 7) + 6 (q - 7) = p q - 7 p + 6 q - 42$

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Question 83 (vii)

Multiply the following:

7pqr, (p - q + r)

Question 83 (xx)

Multiply the following:

$(x^{2} - 5 x + 6), (2 x + 7)$

Multiply the following :

$- 7 p q^{2} r^{3}, - 13 p^{3} q^{2} r$

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