Question 1039
Let x be the width and set up an equation:
:
x(x+5) = 1050
:
Then multiply x with (x+5)
:
x^2+5x = 1050
:
then subtract 1050 from both sides
:
x^2+5x-1050 = 0

Now use the quadratic formula to slove

{{{x=((-5+-sqrt((-5)^2-4(1)(-1050)))/(2(1)))}}}
{{{x=((-5+-sqrt(25+4200))/2)}}}
{{{x=(-5+-65/2)}}}
x = -70/2 or 60/2
x = -35 or 30

Since length can not be negative number, -35 will not be the answer, and 30 is the real answer.
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Dimension of the hopuse lot is 30 x 35