Advertisements
Advertisements
प्रश्न
Expand (2n – 1)(2n + 3)
उत्तर
(2n – 1)(2n + 3)
Comparing (2n – 1)(2n + 3) with (x + a)(x + b) we have a = –1, b = 3
(x + a)(x + b) = x2 + (a + b)x + ab
(2n + (–1))(2n + 3) = (2n)2 + (–1 + 3)2n + (–1)(3)
= 22n2 + 2(2n) – 3
= 4n2 + 4n – 3
APPEARS IN
संबंधित प्रश्न
Expand.
(3x + 4y) (3x + 5y)
Expand.
`(m + 2/3)(m − 7/3)`
Use the Identity (x + a) (x + b) = x2 + (a + b)x + ab to find the following:
95 × 103
Using the identity (x + a)(x + b) = x2 + x(a + b) + ab, find the following product
(6a + 9)(6a – 5)
Simplify using identities
(3p + q)(3p + r)
Multiply the following:
(x2 – 5x + 6), (2x + 7)
Using suitable identities, evaluate the following.
98 × 103
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 + 9x + 20
