Advertisements
Advertisements
प्रश्न
Use the direct method to evaluate :
(3b−1) (3b+1)
योग
Advertisements
उत्तर
Note: (a+b) (a−b) = a2 − b2
(3b−1) (3b+1)
= (3b)2 − (1)2
= 9b2 − 1
shaalaa.com
क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
APPEARS IN
संबंधित प्रश्न
Expand the following, using suitable identity:
(3a – 7b – c)2
Factorise the following:
64a3 – 27b3 – 144a2b + 108ab2
Evaluate of the following:
(103)3
Evaluate of the following:
463+343
Find the following product:
(4x − 3y + 2z) (16x2 + 9y2 + 4z2 + 12xy + 6yz − 8zx)
If a + b + c = 9 and a2+ b2 + c2 =35, find the value of a3 + b3 + c3 −3abc
Find the square of `(3a)/(2b) - (2b)/(3a)`.
If 2x + 3y = 10 and xy = 5; find the value of 4x2 + 9y2
If `x + (1)/x = "p", x - (1)/x = "q"`; find the relation between p and q.
Evaluate the following :
7.16 x 7.16 + 2.16 x 7.16 + 2.16 x 2.16
