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please factorise :- 25x²-4y²+ 28yz - 49z²

$Given 25 x^{2} - 4 y^{2} + 28 y z - 49 z^{2} \Rightarrow 25 x^{2} - (4 y^{2} - 28 y z + 49 z^{2}) \Rightarrow 25 x^{2} - {((2 y)^{2} - 2 (2 y) (7 z) + (7 z)^{2}) \Rightarrow 25 x^{2} - (2 y - 7 z)}^{2} (∵ (a - b)^{2} = a^{2} - 2 a b + b^{2}) \Rightarrow (5 x)^{2} - (2 y - 7 z)^{2} \Rightarrow (5 x + 2 y - 7 z) (5 x - 2 y + 7 z) (∵ a^{2} - b^{2} = (a + b) (a - b))$

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