Advertisements
Advertisements
प्रश्न
Using suitable identities, evaluate the following.
(69.3)2 – (30.7)2
उत्तर
We have,
(69.3)2 – (30.7)2 = (69.3 + 30.7)(69.3 – 30.7) ...[Using the identity, (a + b)(a – b) = a2 – b2]
= 100 × 38.6
= 3860
APPEARS IN
संबंधित प्रश्न
The product of (x + 5) and (x – 5) is ____________
(7x + 3)(7x – 4) = 49x2 – 7x – 12
Using suitable identities, evaluate the following.
(9.7)2 – (0.3)2
Using suitable identities, evaluate the following.
(339)2 – (161)2
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
16x4 – 81
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
y4 – 81
Verify the following:
(a + b + c)(a2 + b2 + c2 – ab – bc – ca) = a3 + b3 + c3 – 3abc
Find the value of a, if 9a = 762 – 672
Find the value of a, if pq2a = (4pq + 3q)2 – (4pq – 3q)2
Find the value of `(6.25 xx 6.25 - 1.75 xx 1.75)/(4.5)`
