Advertisements
Advertisements
Question
If m - n = -2 and m3 - n3 = -26, find mn.
Sum
Advertisements
Solution
m - n = -2, m3 - n3 = -26
(m - n)3 = m3 - n3 - 3mn (m - n)
⇒ (-2)3 = -26 - 3mn (-2)
⇒ 6mn
= - 8 + 26
= 18
⇒ mn = 3.
shaalaa.com
Is there an error in this question or solution?
APPEARS IN
RELATED QUESTIONS
Expand.
(52)3
Expand.
`(2m + 1/5)^3`
Find the cube of: `( 3a - 1/a ) (a ≠ 0 )`
If a + 2b + c = 0; then show that: a3 + 8b3 + c3 = 6abc.
Expand : (3x + 5y + 2z) (3x - 5y + 2z)
Find the cube of: 4x + 7y
Find the cube of: `4"p" - (1)/"p"`
Simplify:
(a + b)3 + (a - b)3
Simplify:
`("a" + 1/"a")^3 - ("a" - 1/"a")^3`
Expand (3p + 4q)3
