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1. $a + b = 9 p, a b = 18 p^{2}$

A. $4 p$
B. $4 p$
C. $4 p$
D. $4 p$

Answer: Option C

Explanation:

(a+b)²=(a-b)²+4ab

Or, (9p)²=(a-b)²+4(18p²)

Or, (a-b)²=81p²-72p²=9p²

Or, a-b=3p

(ans)

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