Question

Q36. Simplify: (2x + 5)2 - (2x - 5)2​

Answer 1

Answer:

follow me

Step-by-step explanation:

2x + 5)2 - (2x - 5)2 = [(2x)2 + 2(2x)(5) + (5)2] - [(2x)2 - 2(2x)(5) + (5)2] = [4x2 + 20x + 25] - [4x2 - 20x + 25] = 4x2 + 20x + 25 - 4x2 + 20x - 25

Answer 2

Answer:

40x

Step-by-step explanation:

Using identity a2 - b2 = (a + b)(a - b)

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

= (4x).(10)

= 40x