You can use trigonometry specially the cos rule in this case. I can’t send the other pictures. But using the cos rule you can check whether the angle is 90
A rectangle has an area of 4y^2 – 49 square units. What are the dimensions of the rectangle?
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I suppose you mean
Then
and the difference quotient is
If it's the case that <em>x</em> ≠ 3, then (<em>x</em> - 3)/(<em>x</em> - 3) reduces to 1, and you would be left with