Advertisements
Advertisements
प्रश्न
Expand (3m + 5)2
Advertisements
उत्तर
(3m + 5)2
Comparing (3m + 5)2 with (a + b)2 we have a = 3m and b = 5
(a + b)2 = a2 + 2ab + b2
(3m + 5)2 = (3m)2 + 2(3m)(5) + 52
= 32m2 + 30m + 25
= 9m2 + 30m + 25
APPEARS IN
संबंधित प्रश्न
Use a suitable identity to get the following products.
(a2 + b2) (− a2 + b2)
Use a formula to multiply of (2t – 5)(2t + 5)
Expand: (2x + 3y)2
If a + b = 10 and ab = 18, find the value of a2 + b2
The sum of areas of two squares with sides 4a and 4b is ______.
Factorise the following, using the identity a2 + 2ab + b2 = (a + b)2.
2x3 + 24x2 + 72x
Factorise the following, using the identity a2 + 2ab + b2 = (a + b)2.
`x^2/4 + 2x + 4`
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.
If p + q = 12 and pq = 22, then find p2 + q2.
Take suitable number of cards given in the adjoining diagram [G(x × x) representing x2, R(x × 1) representing x and Y(1 × 1) representing 1] to factorise the following expressions, by arranging the cards in the form of rectangles:
- 2x2 + 6x + 4
- x2 + 4x + 4.
Factorise 2x2 + 6x + 4 by using the figure.
Calculate the area of figure.
