Subject
Quantitative Aptitude
Topic
General Formula
if a+b=15 and a-b= 1, then ab=?
if a+b=15 and a-b= 1, then ab=?
ক)
20খ)
30গ)
56ঘ)
72Explanation
here, a+b=15-----(i) a-b =1------(ii) i+ii→ 2a=16 or, a=8 i-ii →2b=14 or, b=7 so, ab= 7 x 8 =56Related questions
If a+ b = √ 3 and a-b= √ 2 what is the value of 8ab(a2+b2)?If x + y = a and x-y = b then 2xy = ?Which one of the followings is the simplified results of a – {b – (c – d)}?If a-b=3 and a2+b2= Find the value of ab?If x+y= 19 and x-y= 11, then what is the value of 2x2+ 2y2?If √(3-2x) =1 ,then what is the value of (3-2x)+ (3-2x)2?What is the larger root of the equation of x?If a =2/3 and b=5/7, then find the value of (a+ b)/ (a-b)?