Advertisements
Advertisements
प्रश्न
The value of 2492 – 2482 is ______.
पर्याय
12
477
487
497
Advertisements
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
Use suitable identity to find the following product:
(x + 4) (x + 10)
Evaluate the following using suitable identity:
(99)3
If 3x - 7y = 10 and xy = -1, find the value of `9x^2 + 49y^2`
Write in the expanded form:
`(a + 2b + c)^2`
If x + y + z = 8 and xy +yz +zx = 20, find the value of x3 + y3 + z3 −3xyz
If \[x + \frac{1}{x}\] 4, then \[x^4 + \frac{1}{x^4} =\]
If \[x^3 + \frac{1}{x^3} = 110\], then \[x + \frac{1}{x} =\]
Use the direct method to evaluate :
(ab+x2) (ab−x2)
Evaluate: `(2"x"-3/5)(2"x"+3/5)`
Evaluate: `(4/7"a"+3/4"b")(4/7"a"-3/4"b")`
Simplify by using formula :
(5x - 9) (5x + 9)
Evaluate the following without multiplying:
(999)2
If `"a"^2 - 7"a" + 1` = 0 and a = ≠ 0, find :
`"a" + (1)/"a"`
If a2 - 3a - 1 = 0 and a ≠ 0, find : `"a"^2 - (1)/"a"^2`
If p2 + q2 + r2 = 82 and pq + qr + pr = 18; find p + q + r.
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 ______.
Expand the following:
(3a – 5b – c)2
Give possible expressions for the length and breadth of the rectangle whose area is given by 4a2 + 4a – 3.
