Advertisements
Advertisements
प्रश्न
If a + b = 10 and ab = 18, find the value of a2 + b2
बेरीज
Advertisements
उत्तर
We have (a + b)2 = a2 + 2ab + b2
(a + b)2 = a2 + b2 + 2ab
given a + b = 0 and ab = 18
102 = a2 + b2 + 2(18)
100 = a2 + b2 + 36
100 – 36 = a2 + b2
a2 + b2 = 64
shaalaa.com
या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
APPEARS IN
संबंधित प्रश्न
Find the following squares by suing the identities.
(2xy + 5y)2
Simplify (2x +5)2 − (2x − 5)2
Using identities, evaluate 712
Using (x + a) (x + b) = x2 + (a + b) x + ab, find 103 × 104
Using (x + a) (x + b) = x2 + (a + b) x + ab, find 103 × 98
Expand (5a + 6b)2
Expand `("x"+1/2)^2`
Use the formula to find the value.
502 × 498
Show that (x + 2y)2 – (x – 2y)2 = 8xy
The cost of a chocolate is Rs (x + y) and Rohit bought (x + y) chocolates. Find the total amount paid by him in terms of x. If x = 10, find the amount paid by him.
