Question

(iv) If a'+b' = 10 and a b =3, then find the value of ab.​

Answer 1

Answer:

a+b=10

=>a=10-b

Now

(10-b)xb=3

=>ab=3

Answer 2

a + b = 10.......(1) & ab = 3........(2)

a + b = 10.......(1) & ab = 3........(2) a = 10-b......(3)

pùťţiñĝ thê vàĺuě òf "a" in eqùàŧìòñ (1)

→ ab = 3

→ a(10 - b ) = 3

→ 10a - ab = 3

→ -ab = 3 - 10a

→ ab = -3 + 10a

→ ab = 10 - 3

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