Advertisements
Advertisements
प्रश्न
Using the identity (x + a)(x + b) = x2 + x(a + b) + ab, find the following product
(4x + 3y)(4x + 5y)
उत्तर
(4x + 3y)(4x + 5y)
Substituting x = 4x, a = 3y and b = 5y
In (x + a)(x + b) = x2 + x(a + b) + ab, we get
(4x + 3y)(4x + 5y) = (4x)2 + 4x(3y + 5y) + (3y)(5y)
= 42x2 + 4x(8y) + 15y2
= 16x2 + 32xy + 15y2
(4x + 3y)(4x + 5y) = 16x2 + 32xy + 15y2
APPEARS IN
संबंधित प्रश्न
Expand.
(m − 4)(m + 6)
Expand.
`(m + 2/3)(m − 7/3)`
Expand: (y + 4)(y - 3)
Expand: `(m + 3/2)(m + 1/2)`.
Using the identity (x + a)(x + b) = x2 + x(a + b) + ab, find the following product
(6a + 9)(6a – 5)
(x + a)(x + b) = x2 + (a + b)x + ______.
Using suitable identities, evaluate the following.
104 × 97
Using suitable identities, evaluate the following.
10.1 × 10.2
The following expression is the area of a rectangle. Find the possible length and breadth of the rectangle.
x2 + 9x + 20
