Advertisements
Advertisements
Question
Find the squares of the following:
9m - 2n
Sum
Advertisements
Solution
Using (x + y)2
= x2 + 2xy + y2, we get
(9m - 2n)2
= (9m)2 + 2(9m)(-2n) + (-2n)2
= 81m2 - 36mn + 4n2.
shaalaa.com
Is there an error in this question or solution?
APPEARS IN
RELATED QUESTIONS
If 9x2 + 25y2 = 181 and xy = −6, find the value of 3x + 5y
Write the expanded form:
`(-3x + y + z)^2`
Find the value of 4x2 + y2 + 25z2 + 4xy − 10yz − 20zx when x = 4, y = 3 and z = 2.
If `x^4 + 1/x^4 = 194, "find" x^3 + 1/x^3`
If \[a^2 + \frac{1}{a^2} = 102\] , find the value of \[a - \frac{1}{a}\].
Mark the correct alternative in each of the following:
If \[x + \frac{1}{x} = 5\] then \[x^2 + \frac{1}{x^2} = \]
If \[x^4 + \frac{1}{x^4} = 623\] then \[x + \frac{1}{x} =\]
If a2 - 5a - 1 = 0 and a ≠ 0 ; find:
- `a - 1/a`
- `a + 1/a`
- `a^2 - 1/a^2`
Evaluate the following without multiplying:
(1005)2
If a2 - 3a - 1 = 0 and a ≠ 0, find : `"a" - (1)/"a"`
