You can
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Find the value of x as it relates to the rectangle.
Area: 60 cm^2
Length:x
Width:x+4
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The area is the prodict of the length by the width.
With the given input data, you can guess the answer mentally in 5 seconds: x = 6 cm.
Alternatively, you may solve this quadratic equation
x*(x+4) = 60,
x^2 + 4x - 60 = 0.
Factor
(x-6)*(x+10) = 0.
It leads you to the same answer.
Solved.
