Answer: 28 is the answer.
Explanation: Given expression is [tex]2.\sqrt{98} \sqrt{2}[/tex]
Since, we can write,
⇒ [tex]2.\sqrt{98} \sqrt{2}= 2.\sqrt{49\times 2} \times\sqrt{2}[/tex]
⇒[tex]2.\sqrt{98} \sqrt{2}= 2.\sqrt{49}\times \sqrt{2} \times\sqrt{2}[/tex]
⇒[tex]2.\sqrt{98} \sqrt{2}= 2.\sqrt{49}\times 2[/tex] ( [tex]\sqrt{2} \times \sqrt{2} =2[/tex])
⇒[tex]2.\sqrt{98} \sqrt{2}= 2\times7\times2[/tex] ( Since, [tex]\sqrt{49} =7[/tex])
⇒[tex]2.\sqrt{98} \sqrt{2}= 28[/tex]
