Question

√x -11 = √1521 what is x

Answer 1

the value of x in the following equation is

x=1532

Answer 2

$\sqrt{x - 11} = \sqrt{1521} \\ \sqrt{x - 11} = 39$
squaring both sides.
$x - 11 = 1521 \\ x = 1521 + 11 \\ x = 1532$
the value of x is 1532.
hope this helps you.
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