Question

If a + b = 9 and a b=18
find : I
) a-b
ii) a²-b​

Answer 1

Answer:

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Step-by-step explanation:

a + b = 9

SOBS

(a + b)^2 = 81

a^2 + b^2 +2ab =81

a^2 + b^2 + 36 = 81

a^2 + b^2 = 45

(a - b)^2 = a^2 + b^2 -2ab

(a - b)^2 = 45 - 36

(a - b)^2 = 9

(a - b) = 3

a^2 - b^2 = (a + b)(a - b) = 9*3 = 27