Advertisements
Advertisements
Question
Evaluate: 203 × 197
Sum
Advertisements
Solution
203 × 197
= (200 + 3) (200 − 3)
= (200)2 − (3)2 ......[ ∵ (a − b) (a + b) = a2 − b2]
= 40000 − 9
= 39991
shaalaa.com
Is there an error in this question or solution?
APPEARS IN
RELATED QUESTIONS
Verify:
x3 + y3 = (x + y) (x2 – xy + y2)
If 3x - 7y = 10 and xy = -1, find the value of `9x^2 + 49y^2`
Write in the expanded form (a2 + b2 + c2 )2
If \[x^2 + \frac{1}{x^2}\], find the value of \[x^3 - \frac{1}{x^3}\]
Simplify of the following:
(2x − 5y)3 − (2x + 5y)3
If x = −2 and y = 1, by using an identity find the value of the following
\[\left( \frac{2}{x} - \frac{x}{2} \right) \left( \frac{4}{x^2} + \frac{x^2}{4} + 1 \right)\]
Evaluate `(a/[2b] + [2b]/a )^2 - ( a/[2b] - [2b]/a)^2 - 4`.
Evaluate the following without multiplying:
(95)2
Evaluate the following :
1.81 x 1.81 - 1.81 x 2.19 + 2.19 x 2.19
If `49x^2 - b = (7x + 1/2)(7x - 1/2)`, then the value of b is ______.
