Question

busing identity , find (2x + 5)2 - (2x - 5)2​

Answer 1

Answer:

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Step-by-step explanation:

Using (a−b)(a−b)=a

2

+b

2

−2ab

For the above expression, keeping a=2x and b=5, we get

(2x−5)(2x−5)=4x

2

+25−20x

Answer 2

Answer: 20

Step-by-step explanation:

(2x+5)2 - ( 2x-5)2

4x+10 - 4x + 10

10 + 10

20