Advertisements
Advertisements
प्रश्न
Evaluate: (1.6x + 0.7y) (1.6x − 0.7y)
बेरीज
उत्तर
(1.6x + 0.7y) (1.6x − 0.7y)
= (1.6x)2 − (0.7y)2 ......[ ∵ (a − b) (a +b) = a2 − b2]
= 2.56x2 − 0.49y2
shaalaa.com
या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
APPEARS IN
संबंधित प्रश्न
Expand the following, using suitable identity:
(x + 2y + 4z)2
Factorise the following:
64a3 – 27b3 – 144a2b + 108ab2
If 2x+3y = 13 and xy = 6, find the value of 8x3 + 27y3
If x + y + z = 8 and xy +yz +zx = 20, find the value of x3 + y3 + z3 −3xyz
If a - b = 0.9 and ab = 0.36; find:
(i) a + b
(ii) a2 - b2.
Use direct method to evaluate the following products :
(x + 8)(x + 3)
Use the direct method to evaluate the following products :
(5a + 16) (3a – 7)
Find the squares of the following:
3p - 4q2
Simplify:
(4x + 5y)2 + (4x - 5y)2
Evaluate the following :
7.16 x 7.16 + 2.16 x 7.16 + 2.16 x 2.16
