Question
Download Solution PDFयदि a + b = 12 और 4ab = 140 है, तो a2 + b2 का मान क्या है?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFदिया गया है:
यदि a + b = 12 और 4ab = 140
प्रयुक्त सूत्र:
(a + b)2 = a2 + b2 + 2ab
गणना:
(a + b)2 = 122
⇒ 144 = a2 + b2 + 2ab
चूँकि, 4ab = 140
⇒ ab = 35
⇒ 144 = a2 + b2 + 2 x 35
⇒ 144 = a2 + b2 + 70
⇒ a2 + b2 = 74
∴ सही उत्तर विकल्प 2 है।
Last updated on Feb 22, 2025
-> DFCCIL Executive Recruitment 2025 Correction window is open from 31st March, to 4th April 2025.
-> Candidates can make correction in their application form, if they have made any mistake. There will be 100/- fee for correction in form.
-> DFCCIL Executive Recruitment 2025 application deadline has been extended.
-> Eligible and Interested candidates had applied from 18th January 2025 to 22nd March 2025.
-> A total of 175 Vacancies have been announced for multiple posts like Executive (Civil, Electrical, Signal and Telecommunication).
-> Candidates who will get a successful selection under the DFCCIL Recruitment 2025 for the Executive selection process will get a salary range between Rs. 30,000 to Rs. 1,20,000.
-> Candidates must refer to the DFCCIL Executive Previous Year Papers to prepare well for the exam.