Question

If 49x2 - b = ( 7x + 3) ( 7x - 3 ) then value of b is​

Answer 1

Answer:

the value of b is 9 but I am not conform

Answer 2

Answer:

b = 9

Step-by-step explanation:

$(7x + 3)(7x - 3) = 49 {x}^{2} - b\\ = > (7x + 3)(7x - 3) = {(7x)}^{2} - {(3)}^{2} \\ as \: (a + b)(a - b) = {a}^{2} - {b}^{2} \\ = > (7x + 3)(7x - 3) = \: 49 {x}^{2} - 9 \\ = > b = 9$

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