Advertisements
Advertisements
Question
Using the identity (x + a)(x + b) = x2 + x(a + b) + ab, find the following product
(x + 3)(x + 7)
Advertisements
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.
(13 + x) (13 − x)
Expand.
(9x − 5t) (9x + 3t)
Use the Identity (x + a) (x + b) = x2 + (a + b)x + ab to find the following:
95 × 103
Expand: (2a + 3b)(2a - 3b).
Evaluate the following, using suitable identity
51 × 52
Multiply the following:
(x2 – 5x + 6), (2x + 7)
Using suitable identities, evaluate the following.
104 × 97
Using suitable identities, evaluate the following.
101 × 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 – 7x + 10
