If A and B are zeros of x square - 4 x + 1 then One Upon A plus one upon B minus A×B is
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Answer:
The answer is 1
Explanation :
x² - 4x + 1 = 0
using quadratic formula
x = -b ±√4ac / 2a ; where (a = 1 , b = -4 , c = 1 ) according to the question
= - ( - 4) ±√4 × 1 × 1 / 2 ×1
= 4 ± √4 / 2
= 4 + 2 / 2 or 4 - 2 / 2
= 6 / 2 = 3 ⇒A OR 2 / 2 = 1 ⇒ B
according to question :
1 / A + 1/ B - 1 / AB
= 1/3 + 1 / 1 - 1/3
= 1
I HOPE THIS WILL HELP YOU
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