Question

If 25 x 2 −  k = (5 x + 2)(5 x − 2), then what is the value of  k?
kindly dont put any answer if you dont know, thx! ​

Answer 1

Answer:

k = 4

Step-by-step explanation:

25x² - k = (5x + 2)(5x - 2)

25x² - k = (5x)² - (2)² [∵ (a + b)(a - b) = a² - b²]

25x² - k = 25x² - 4

-k = -4                        [When 25x² is transposed, it gets cancelled]

∴k = 4

Hence, the value of k = 4