Advertisements
Advertisements
प्रश्न
Expand the following, using suitable identities.
(2x + 9)(2x – 7)
बेरीज
Advertisements
उत्तर
We have,
(2x + 9)(2x – 7) = (2x + 9)[(2x + (–7)]
= (2x)2 + [9 + (–7)]2x + 9 × (–7) ...[Using the identity, (x + a)(x + b) = x2 + (a + b)x + ab]
= 4x2 + 4x – 63
shaalaa.com
या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 7: Algebraic Expression, Identities and Factorisation - Exercise [पृष्ठ २३२]
APPEARS IN
संबंधित प्रश्न
Show that (3x + 7)2 − 84x = (3x − 7)2
Simplify the following using the formula: (a − b)(a + b) = a2 − b2: (467)2 − (33)2
Simplify the following using the formula: (a − b)(a + b) = a2 − b2: 9.8 × 10.2
Simplify the following using the identities: 178 × 178 − 22 × 22
Find the following product: (x + 7) (x − 5)
Find the following product: (x2 + 4) (x2 + 9)
Evaluate the following: 34 × 36
Expand the following:
(−p + 2q + 3r)2
Simplify:
(b2 – 49)(b + 7) + 343
Using suitable identities, evaluate the following.
(98)2
