Advertisements
Advertisements
प्रश्न
Expand the following, using suitable identities.
(2x + 9)(2x – 7)
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
APPEARS IN
संबंधित प्रश्न
Show that `(4/3 m - 3/4 n)^2 + 2mn = 16/9 m^2 + 9/16 n^2`
Show that (a - b)(a + b) + (b - c) (b + c) + (c - a) (c + a) = 0
Expand the following:
(2p + 3)(2p – 4)(2p – 5)
Using algebraic identity, find the coefficients of x2, x and constant term without actual expansion
(x + 5)(x + 6)(x + 7)
Evaluate the following by using identities:
10013
Multiply the following:
(2x – 2y – 3), (x + y + 5)
Simplify:
`(7/9 a + 9/7 b)^2 - ab`
Expand the following, using suitable identities.
(2x – 5y)(2x – 5y)
Carry out the following division:
76x3yz3 ÷ 19x2y2
Perform the following division:
(– qrxy + pryz – rxyz) ÷ (– xyz)
