You should use your calculator for such simple sums. It is far quicker and involves fewer key depressions than posting the question on WA. But since you seem unable to carry out even this simple task, the answer is 24.5
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7 groups of 7 times table for 7s 7 x 1 = 7 7 x 2 = 14 7 more and more and more. answer: 7 x 7 = 49
49 same as positive seven squared
This is called an inequality. If x squared is greater than or equal to 49, then x is plus or minus 7 or greater than plus 7 or less than - 7.
(x-7)2
49 x 49 = 492 = 2401