Advertisements
Advertisements
Question
Using identity, find the value of (4.9)2
Sum
Advertisements
Solution
(4.9)2 = (5 – 0.1)2
Substituting a = 5 and b = 0.1 in
(a – b)2 = a2 – 2ab + b2, we have
(5 – 0.1)2 = 52 – 2(5)(0.1) + (0.1)2
(4.9)2 = 25 – 1 + 0.01 = 24 + 0.01
(4.9)2 = 24.01
shaalaa.com
Is there an error in this question or solution?
APPEARS IN
RELATED QUESTIONS
Evaluate the following, using suitable identity
9982
Show that (m – n)2 + (m + n)2 = 2(m2 + n2)
The factors of x2 – 6x + 9 are
A square lawn has a 2 m wide path surrounding it. If the area of the path is 136 m2, find the area of lawn
Square of 9x – 7xy is ______.
1032 – 1022 = ______ × (103 – 102) = ______.
Using suitable identities, evaluate the following.
(9.9)2
Factorise the following.
x2 – 17x + 60
Factorise the following.
p2 – 13p – 30
Factorise the following.
a2 – 16p – 80
