Advertisements
Advertisements
प्रश्न
The value of 2492 – 2482 is ______.
पर्याय
12
477
487
497
उत्तर
The value of 2492 – 2482 is 497.
Explanation:
Consider the expression:
2492 – 2482
Use the identity: a2 – b2 = (a + b)(a – b)
2492 – 2482 = (249 + 248)(249 – 248)
= 497 × 1
= 497
APPEARS IN
संबंधित प्रश्न
Factorise the following using appropriate identity:
9x2 + 6xy + y2
Factorise the following using appropriate identity:
4y2 – 4y + 1
Simplify the following products:
`(x/2 - 2/5)(2/5 - x/2) - x^2 + 2x`
Find the cube of the following binomials expression :
\[\frac{3}{x} - \frac{2}{x^2}\]
If x = 3 and y = − 1, find the values of the following using in identify:
\[\left( \frac{x}{7} + \frac{y}{3} \right) \left( \frac{x^2}{49} + \frac{y^2}{9} - \frac{xy}{21} \right)\]
If a + b = 6 and ab = 20, find the value of a3 − b3
If \[a^2 + \frac{1}{a^2} = 102\] , find the value of \[a - \frac{1}{a}\].
If a + b + c = 9 and ab + bc + ca = 23, then a2 + b2 + c2 =
If a + b + c = 9 and ab + bc + ca =23, then a3 + b3 + c3 − 3abc =
Use direct method to evaluate the following products :
(x + 8)(x + 3)
Use the direct method to evaluate :
`(3/5"a"+1/2)(3/5"a"-1/2)`
Evaluate: `(4/7"a"+3/4"b")(4/7"a"-3/4"b")`
Evaluate: 203 × 197
If `"a" + 1/"a" = 6;`find `"a" - 1/"a"`
If a2 + b2 + c2 = 41 and a + b + c = 9; find ab + bc + ca.
If p2 + q2 + r2 = 82 and pq + qr + pr = 18; find p + q + r.
Simplify:
(x + 2y + 3z)(x2 + 4y2 + 9z2 - 2xy - 6yz - 3zx)
If `49x^2 - b = (7x + 1/2)(7x - 1/2)`, then the value of b is ______.
If a + b + c = 0, then a3 + b3 + c3 is equal to ______.
