Question

factorise all the problems
1.x^2-9
2.x^2-4
3.a^2-25
4.p^2-1
5.16a^2-121
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Answer 1

Step-by-step explanation:

1.x^2 - 9

Soln :

given:

x^2 - 9

= x^2 - 3^2 ( Note : (a^2- b^2) = (a+b)(a-b)

= (x+b) ( x-b)

2.Soln:

given :

x^2 -4

= x^2 - 2^2

= (x+2 ) ( x-b)

3.Soln:

given:

a^ 2 -25

= a^2 - 5^2

= (a+5)( a-b)

4.Soln:

given:

p^2 -1

=( p+1) ( p-1)

5.Soln:

given:

16 a^2 - 121

= 16 a^2 - 11^2

= 16( a+11) ( a-11)