Advertisements
Advertisements
Question
Find the following squares by suing the identities.
(2xy + 5y)2
Advertisements
Solution
(2xy + 5y)2 = (2xy)2 + 2(2xy) (5y) + (5y)2
[(a + b)2 = a2 + 2ab + b2]
= 4x2y2 + 20xy2 + 25y2
RELATED QUESTIONS
Using identities, evaluate 9982
Using identities, evaluate (5.2)2
Using (x + a) (x + b) = x2 + (a + b) x + ab, find 103 × 104
Expand:
(2a – 3b)2
Expand: (51)2
Simplify: (a + b)2 – 4ab
Factorise the following using suitable identity
a2 + 6ab + 9b2 – c2
Factorise the following, using the identity a2 + 2ab + b2 = (a + b)2.
x2 + 12x + 36
The area of a circle is given by the expression πx2 + 6πx + 9π. Find the radius of the circle.
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.
