Advertisements
Advertisements
प्रश्न
Using suitable identities, evaluate the following.
10.1 × 10.2
मूल्यांकन
Advertisements
उत्तर
We have,
10.1 × 10.2 = (10 + 0.1)(10 + 0.2)
= (10)2 + (0.1 + 0.2)10 + (0.1)(0.2) ...[Using the identity, (x + a)(x + b) = x2 + (a + b)x + ab]
= 100 + 0.3 × 10 + 0.02
= 103.02
shaalaa.com
क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 7: Algebraic Expression, Identities and Factorisation - Exercise [पृष्ठ २३३]
APPEARS IN
संबंधित प्रश्न
Expand.
(a + 2) (a − 1)
Expand.
(p + 8) (p − 3)
Expand.
(13 + x) (13 − x)
Expand.
`(x + 1/x)(x - 1/x)`
Expand: (x + 2)(x + 3).
Expand: (2a + 3b)(2a - 3b).
Expand: `(m + 3/2)(m + 1/2)`.
Expand: (x - 3)(x - 7).
Using suitable identities, evaluate the following.
104 × 97
The following expression is the area of a rectangle. Find the possible length and breadth of the rectangle.
x2 + 9x + 20
