Question

22. Simplify: (2x + 5)2 - (2x - 5)2 – 40x​

Answer 1

Answer:

= using a²-b²= (a+b)(a-b)

(2x+5+2x-5)(2x+5-2x+5)-40x

=40x-40x

=0

Answer 2

Answer:

(2x+5)²-(2x-5)²-40x = 0

Step-by-step explanation:

/* we know that,

(a+b)²-(a-b)² = 4ab */

Here , a = 2x , b = 5

Now,

(2x+5)²-(2x-5)²-40x

= 4×(2x)×5 - 40x

= 40x - 40x

= 0

Therefore,

(2x+5)²-(2x-5)²-40x = 0

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