Advertisements
Advertisements
प्रश्न
Use a suitable identity to get the following products
(2a − 7) (2a − 7)
Advertisements
उत्तर
(2a − 7) (2a − 7) = (2a − 7)2
= (2a)2 − 2(2a) (7) + (7)2 [(a − b)2 = a2 − 2ab + b2]
= 4a2 − 28a + 49
APPEARS IN
संबंधित प्रश्न
Use a suitable identity to get the following products.
(1.1m − 0.4) (1.1 m + 0.4)
Find the following squares by suing the identities.
`(2/3 m + 3/4 n)^2`
Using identities, evaluate 1022
Using identities, evaluate (5.2)2
Using (x + a) (x + b) = x2 + (a + b) x + ab, find 5.1 × 5.2
Expand (ax + by)2
Factorise the following using suitable identity
a2 + 6ab + 9b2 – c2
(a + b)2 = a2 + b2
The area of a rectangle is x2 + 7x + 12. If its breadth is (x + 3), then find its length.
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.
