If $m^2 - n^2 = 21$ and m - n = 3 find the value of m + n.
Answer & explanation
Correct answer: option 1
If $m^2 - n^2 = 21$
m - n = 3
find the value of m + n.
$m^2 - n^2$ = (m + n)(m - n)
21 = (m + n) (3)
(m + n) = 7
If $m^2 - n^2 = 21$ and m - n = 3 find the value of m + n.
Correct answer: option 1
If $m^2 - n^2 = 21$
m - n = 3
find the value of m + n.
$m^2 - n^2$ = (m + n)(m - n)
21 = (m + n) (3)
(m + n) = 7