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Verified answer

[tex]\red{ Explanation : - }[/tex]

[tex]7 \sqrt{2x {}^{2} } - 10x - 4 \sqrt{2} [/tex]

[tex]7 \sqrt{2 \times 4 \sqrt{2 } } = 56 = 14 \times 64[/tex]

[tex](14 - 4) = 10[/tex]

[tex] = 7 \sqrt{2x {}^{2} } - (14 - 4)x - 4 \sqrt{2} [/tex]

[tex] = 7 \sqrt{2x {}^{2} } - 14 x + 4x - 4 \sqrt{2} [/tex]

[tex] =\fbox(7 \sqrt{2x} + 4)(x - \sqrt{2)} [/tex]