Question

expand the following by using identities ( 2x+5 ) ( 2x-5 )​

Answer 1

Answer:

Step-by-step explanation:

Using the identity is (m+a)(m+b)=m  

2

+m(a+b)+ab.

Given: (2x+3)(2x+5) we apply the above identity by taking

m=2x, a=3 , b=5.

We get, (2x+3)(2x+5)=(2x)  

2

+(2x)(3+5)+(3×5)=4x  

2

+(2x)(8)+15=4x  

2

+16x+15

Hence, (2x+3)(2x+5)=4x  

2

+16x+15.

Answer 2

op gyes sinA + 2cosA = 1

Then find the value of

2sinA +cosA