Question

1. What is the smallest number of four digits which is a perfect square?
2. $\sqrt55 * \sqrt220$

Answer 1

Answer:

{x}^{2}  + 6x - 7 \\  =  {x}^{2}   - x + 7x - 7 \\  = x(x - 1) + 7(x - 1) \\  = (x + 7)(x - 1)

Step-by-step explanation:

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