Advertisements
Advertisements
प्रश्न
If p + q = 8 and p - q = 4, find:
pq
Advertisements
उत्तर
(p + q)2 = (8)2
p2 + q2 + 2pq = 64 ...(i)
(p - q)2 = (4)2
p2 + q2 - 2pq = 16
p2 + q2 = 16 + 2pq ...(ii)
Using (ii) in (i), we get :
16 + 2pq + 2pq = 64
⇒ 4pq
= 64 - 16
= 48
⇒ pq = 12.
APPEARS IN
संबंधित प्रश्न
What are the possible expressions for the dimensions of the cuboids whose volume is given below?
| Volume : 12ky2 + 8ky – 20k |
Find the cube of the following binomials expression :
\[2x + \frac{3}{x}\]
If 2x+3y = 13 and xy = 6, find the value of 8x3 + 27y3
Evaluate of the following:
(9.9)3
If x = −2 and y = 1, by using an identity find the value of the following
If the volume of a cuboid is 3x2 − 27, then its possible dimensions are
Find the square of : 3a + 7b
If `x + (1)/x = 3`; find `x^2 + (1)/x^2`
Factorise the following:
9y2 – 66yz + 121z2
Expand the following:
(3a – 2b)3
