Advertisements
Advertisements
प्रश्न
Evaluate, using (a + b)(a - b)= a2 - b2.
399 x 401
Advertisements
उत्तर
399 x 401
= (400 - 1) x (400 + 1)
= (400)2 - (1)2
= 160000 - 1
= 159999.
APPEARS IN
संबंधित प्रश्न
Simplify the following expressions:
`(x + y - 2z)^2 - x^2 - y^2 - 3z^2 +4xy`
If \[x^2 + \frac{1}{x^2} = 98\] ,find the value of \[x^3 + \frac{1}{x^3}\]
If x = 3 and y = − 1, find the values of the following using in identify:
\[\left( \frac{x}{y} - \frac{y}{3} \right) \frac{x^2}{16} + \frac{xy}{12} + \frac{y^2}{9}\]
Evaluate:
483 − 303 − 183
If \[x - \frac{1}{x} = \frac{15}{4}\], then \[x + \frac{1}{x}\] =
If \[3x + \frac{2}{x} = 7\] , then \[\left( 9 x^2 - \frac{4}{x^2} \right) =\]
Use the direct method to evaluate :
(3x2+5y2) (3x2−5y2)
If `"r" - (1)/"r" = 4`; find : `"r"^4 + (1)/"r"^4`
Evaluate the following :
1.81 x 1.81 - 1.81 x 2.19 + 2.19 x 2.19
Give possible expressions for the length and breadth of the rectangle whose area is given by 4a2 + 4a – 3.
