Since both positive*positive and negative*negative equal a positive number, the square root of 16 can either be +4 or -4.
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x2 = 16take the root square for both sides the result will be :X = +4 or -4
If you meant x2 = 16 then take square root both sides which gives x = 4 but you need to see that -42 is also 16 so that is another solution. The two solutions are 4 and -4.
x2-10 = 0 x2 = 10 x = the square root of 10
x2 + 6x = 7 ⇒ x2 + 6x + 9 = 7 + 9 ⇒ (x + 3)2 = 16 ⇒ x + 3 = ±4 ⇒ x = -7 or 1