Advertisements
Advertisements
प्रश्न
Use the direct method to evaluate :
(3b−1) (3b+1)
बेरीज
Advertisements
उत्तर
Note: (a+b) (a−b) = a2 − b2
(3b−1) (3b+1)
= (3b)2 − (1)2
= 9b2 − 1
shaalaa.com
या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
APPEARS IN
संबंधित प्रश्न
Factorise the following:
`27p^3-1/216-9/2p^2+1/4p`
Factorise:
27x3 + y3 + z3 – 9xyz
Evaluate the following using identities:
(399)2
Evaluate following using identities:
991 ☓ 1009
Simplify of the following:
\[\left( x + \frac{2}{x} \right)^3 + \left( x - \frac{2}{x} \right)^3\]
Find the following product:
\[\left( 3 + \frac{5}{x} \right) \left( 9 - \frac{15}{x} + \frac{25}{x^2} \right)\]
If a + b + c = 9 and ab + bc + ca = 23, then a2 + b2 + c2 =
Expand the following:
(3x + 4) (2x - 1)
Expand the following:
(2x - 5) (2x + 5) (2x- 3)
Simplify:
(3a + 2b - c)(9a2 + 4b2 + c2 - 6ab + 2bc +3ca)
