Advertisements
Advertisements
Question
Using the identity (x + a)(x + b) = x2 + x(a + b) + ab, find the following product
(x + 3)(x + 7)
Solution
(x + 3)(x + 7)
Let a = 3, b = 7
(x + 3)(x + 7) is of the form x2 + x(a + b) + ab
(x + 3)(x + 7) = x2 + x(3 + 7) + (3 × 7)
= x2 + 10x + 21
APPEARS IN
RELATED QUESTIONS
Expand.
(p + 8) (p − 3)
Expand.
`(1/y + 4)(1/y - 9)`
Expand: (x + 2)(x + 3).
Expand: (2a + 3b)(2a - 3b).
Expand: `(m + 3/2)(m + 1/2)`.
Using the identity (x + a)(x + b) = x2 + x(a + b) + ab, find the following product
(8 + pq)(pq + 7)
Evaluate the following, using suitable identity
51 × 52
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 + 19x – 20
The following expression is the area of a rectangle. Find the possible length and breadth of the rectangle.
x2 + 9x + 20
