If a + b = 10 and 
then what is the value of 3ab + 4a2 + 5b2 ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2. (i.e. 300)
By putting a = b = 5, we get → a + b = 10
⇒ 3ab + 4a2 + 5b2
⇒ 75 + 100 +125 = 300
⇒ 300
SSC CGL 2018 PYQ — Question 20
SSC CGL Tier II Quant - 20/02/2018 • Quantitative Aptitude • Q20