If a + b = 24 and $a^2 + b^2 = 306 $, where a > b, then the value of 4a - 5b is :
Answer & explanation
Correct answer: option 4
If a + b = 24
$a^2 + b^2 = 306 $
where a > b, then the value of 4a - 5b= ?
Put the value of a = 15 and b = 9 (These values will satisfy the given equation)
4a – 5b = 4 × 15 – 5 × 9
= 60 – 45
= 15