Advertisements
Advertisements
Question
Factorise the following.
x2 + 9x + 20
Solution
We have,
x2 + 9x + 20 = x2 + 5x + 4x + 5 × 4
= x(x + 5) + 4(x + 5)
= (x + 5)(x + 4)
APPEARS IN
RELATED QUESTIONS
Simplify (2.5p − 1.5q)2 − (1.5p − 2.5q)2
Using identities, evaluate 297 × 303
Using identities, evaluate 8.92
Using identities, evaluate 1.05 × 9.5
Use the formula to multiply the following.
(a + 6) (a − 6)
Expand: (2x + 3y)2
Expand: (51)2
Simplify: (a + b)2 – 4ab
Factorise the following, using the identity a2 + 2ab + b2 = (a + b)2.
9x2 + 24x + 16
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.
