Question

$x = \sqrt{676 + 2 + 4 + 6 + ... + 1350}$
​1350

Answer 1

x = √(676 + 2 + 4 + .. + 1350)

= √[676 + 2(1 + 2 + .. 675)]

= √(676 + 2×675×676 : 2)

= √(676 + 675×676)

= √676(1 + 675)

= √676×676

= √676²

= 676