Advertisements
Advertisements
प्रश्न
Using suitable identities, evaluate the following.
(9.7)2 – (0.3)2
Advertisements
उत्तर
We have,
(9.7)2 – (0.3)2 = (9.7 + 0.3)(9.7 – 0.3) ...[Using the identity, a2 – b2 = (a + b)(a – b)]
= 10 × 9.4
= 94
APPEARS IN
संबंधित प्रश्न
(7x + 3)(7x – 4) = 49x2 – 7x – 12
The value of p for 512 – 492 = 100p is 2.
Factorise the expression and divide them as directed:
(x2 – 22x + 117) ÷ (x – 13)
The base of a parallelogram is (2x + 3 units) and the corresponding height is (2x – 3 units). Find the area of the parallelogram in terms of x. What will be the area of parallelogram of x = 30 units?
Verify the following:
(a + b + c)(a2 + b2 + c2 – ab – bc – ca) = a3 + b3 + c3 – 3abc
Verify the following:
(a2 – b2)(a2 + b2) + (b2 – c2)(b2 + c2) + (c2 – a2) + (c2 + a2) = 0
Find the value of a, if 9a = 762 – 672
Find the value of a, if pqa = (3p + q)2 – (3p – q)2
Find the value of `(6.25 xx 6.25 - 1.75 xx 1.75)/(4.5)`
The product of two expressions is x5 + x3 + x. If one of them is x2 + x + 1, find the other.
