Question

if a^2-b^2=21and a^2+b^2=29,which of the
value of ab

Answer 1

a=25, b=2

Answer 2

wuhuuuuuuuuuuuuu :D

Answer 3

a^2-b^2=21
a^2+b^2=29
adding we get,2a^2=50
a^2=25
a=5

similarly,subtracting,-2b^2=-8
b^2=4
b=2

ab=5*2
ab=10

Answer 4

Strictly speaking, plus minus 2 and 5.