Advertisements
Advertisements
प्रश्न
If p2 + q2 + r2 = 82 and pq + qr + pr = 18; find p + q + r.
बेरीज
Advertisements
उत्तर
(p + q + r)2
= p2 + q2 + r2 + 2pq + 2qr + 2pr
= 82 + 2(18)
= 64 + 36
= 100
⇒ p + q + r
= `sqrt(100)`
= ± 10.
shaalaa.com
या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
APPEARS IN
संबंधित प्रश्न
Evaluate the following using suitable identity:
(998)3
Without actually calculating the cubes, find the value of the following:
(–12)3 + (7)3 + (5)3
Simplify the following products:
`(x^3 - 3x^2 - x)(x^2 - 3x + 1)`
If \[x + \frac{1}{x} = 5\], find the value of \[x^3 + \frac{1}{x^3}\]
The product (x2−1) (x4 + x2 + 1) is equal to
Find the square of 2a + b.
Use the direct method to evaluate :
(2+a) (2−a)
Evaluate: (2 − z) (15 − z)
Evaluate, using (a + b)(a - b)= a2 - b2.
999 x 1001
If a2 - 3a - 1 = 0 and a ≠ 0, find : `"a"^2 - (1)/"a"^2`
