Advertisements
Advertisements
Question
Using suitable identities, evaluate the following.
98 × 103
Evaluate
Advertisements
Solution
We have,
98 × 103 = (100 – 2)(100 + 3)
= (100)2 + (–2 + 3)100 + (–2) × 3 ...[Using the identity, (x + a)(x + b) = x2 + (a + b)x + ab]
= 10000 + 100 – 6
= 10094
shaalaa.com
Is there an error in this question or solution?
Chapter 7: Algebraic Expression, Identities and Factorisation - Exercise [Page 233]
APPEARS IN
RELATED QUESTIONS
Expand.
(a + 2) (a − 1)
Expand.
(m − 4)(m + 6)
Expand.
(3x + 4y) (3x + 5y)
Expand.
(9x − 5t) (9x + 3t)
Expand.
`(1/y + 4)(1/y - 9)`
Use the Identity (x + a)(x + b) = x2 + (a + b)x + ab to find the following:
501 × 502
Using the identity (x + a)(x + b) = x2 + x(a + b) + ab, find the following product
(8 + pq)(pq + 7)
Multiply the following:
(x2 – 5x + 6), (2x + 7)
The following expression is the area of a rectangle. Find the possible length and breadth of the rectangle.
x2 – 6x + 8
The following expression is the area of a rectangle. Find the possible length and breadth of the rectangle.
x2 + 19x – 20
