Question

If [k + 4b][5a - 4b]=25a²-16b, then k =
1) 4a
2) 5a
3) 4b
4) 5b

Answer 1

Step-by-step explanation:

(k + 4b)(5a - 4b) = 25a² - 16b²

This might be solved using identity i.e., (a + b) (a - b) = a² - b²

so k will be 5a

(5a + 4b)(5a - 4b) = 25a² - 16b²

25a² - 16b² = 25a² - 16b²

As L.H.S = R.H.S

Therefore k = 5a

(2) 5a

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