Advertisements
Advertisements
प्रश्न
Using (x + a) (x + b) = x2 + (a + b) x + ab, find 9.7 × 9.8
Advertisements
उत्तर
9.7 × 9.8 = (10 − 0.3) (10 − 0.2)
= (10)2 + [(− 0.3) + (− 0.2)] (10) + (− 0.3) (− 0.2)
= 100 + (− 0.5)10 + 0.06 = 100.06 − 5 = 95.06
APPEARS IN
संबंधित प्रश्न
Use a suitable identity to get the following products.
`(3a - 1/2)(3a - 1/2)`
Use a suitable identity to get the following products.
(− a + c) (− a + c)
Use a suitable identity to get the following products.
(7a − 9b) (7a − 9b)
Use the formula to find the value.
502 × 498
Expand: (10 + y)2
Use a formula to multiply of (4z – 5y)(4z + 5y)
Expand: (2x + 3y)2
Simplify: (a + b)2 – 4ab
The sum of areas of two squares with sides 4a and 4b is ______.
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.
