Advertisements
Advertisements
Question
Use the direct method to evaluate :
`("z"-2/3)("z"+2/3)`
Sum
Advertisements
Solution
Note: (a+b) (a−b) = a2 − b2
`("z"-2/3)("z"+2/3)=("z")^2-(2/3)^2`
`="z"^2-4/9`
shaalaa.com
Is there an error in this question or solution?
APPEARS IN
RELATED QUESTIONS
Use suitable identity to find the following product:
`(y^2+3/2)(y^2-3/2)`
Evaluate the following using suitable identity:
(998)3
If a + b + c = 9 and ab + bc + ca = 23, find the value of a2 + b2 + c2.
Find the cube of the following binomials expression :
\[\frac{3}{x} - \frac{2}{x^2}\]
If \[x - \frac{1}{x} = \frac{1}{2}\],then write the value of \[4 x^2 + \frac{4}{x^2}\]
The product (x2−1) (x4 + x2 + 1) is equal to
If a2 - 5a - 1 = 0 and a ≠ 0 ; find:
- `a - 1/a`
- `a + 1/a`
- `a^2 - 1/a^2`
Use the direct method to evaluate :
(2+a) (2−a)
Simplify by using formula :
(2x + 3y) (2x - 3y)
Factorise the following:
9y2 – 66yz + 121z2
