Question

use a suitable identity solve; (4x-5)(4x+5)

Answer 1

Answer:

16$x^{2}$ - 25

Step-by-step explanation:

(4x-5)(4x+5)                [∵ (a-b)(a+b) = $a^{2} - b^{2}$]

= $(4x)^{2} - 5^{2}$

= 16$x^{2}$ - 25 (Ans)

Answer 2

Step-by-step explanation:

(4x-5)(4x5)

-20x20

-400

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