Advertisements
Advertisements
प्रश्न
Expand the following, using suitable identities.
(x + 3)(x + 7)
Advertisements
उत्तर
We have,
(x + 3)(x + 7) = x2 + (3 + 7)x + 3 × 7 ...[Using the identity, (x + a)(x + b) = x2 + (a + b)x + ab]
= x2 + 10x + 21
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: 1.8 × 2.2
If 2x + 3y = 14 and 2x − 3y = 2, find the value of xy.
[Hint: Use (2x + 3y)2 − (2x − 3y)2 = 24xy]
Find the following product: \[\left( x + \frac{4}{3} \right)\left( x + \frac{3}{4} \right)\]
Simplify:
(b2 – 49)(b + 7) + 343
Simplify:
(4.5a + 1.5b)2 + (4.5b + 1.5a)2
Expand the following, using suitable identities.
(x2y – xy2)2
Expand the following, using suitable identities.
`((4x)/5 + y/4)((4x)/5 + (3y)/4)`
Using suitable identities, evaluate the following.
(49)2
Using suitable identities, evaluate the following.
47 × 53
