Question

using suitable identities find the following products (11x+9) (11x+15)​

Answer 1

Answer:

Step-by-step explanation:

We use identities

(x+a)(x+b)=x  

2

+(a+b)x+ab and x  

2

−y  

2

=(x+y)(x−y)

(i) (x+4)(x+10)

=x  

2

+(4+10)x+(4)(10)

=x  

2

+14x+40

(ii) (x+8)(x−10)

=x  

2

+(8−10)+(8)(−10)

=x  

2

−2x−80

(iii) (3x+4)(3x+5)

=(3x)  

2

+(4−5)3x+(4)(−5)

=9x  

2

−3x−20

(iv) (y  

2

+  

2

3

​

)(y  

2

−  

2

3

​

)

=(y  

2

)  

2

−(  

2

3

​

)  

2

 

=y  

4

−  

4

9

​

 

(v) (3−2x)(3+2x)

=(3)  

2

−(2x)  

2

=9−4x  

2

 

Video Explanation

Answer 2

Answer:

this is the correct ans of this question