What do you know about the difference of two squares?
One is easier to solve than the other
But now I understand how to solve the problem. I should had seen it in the beginning. Thanks you two.
Answer is: {7,-7}
That's the wrong answer? Then I don't know. Just thought it was right. What you guys want me to answer? 7 Couldn't be squared, so I assumed k={7,-7} OH! I see. I written down the answer incorrectly.
$\displaystyle + - \sqrt 7$