1.

(2x + 5)(2x - 5) = ?A. (4x2 + 25)B. (4x2 - 25)C. (4x2 - 10x + 25)D. (4x2 + 10x - 25)

Answer»

We know that,

From formula, (a + b)(a – b) = a2 – b2

(2x + 5)(2x – 5) = (2x)2 – (5)2

= 4x2 – 25



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