Without an indication of the equals sign, this is not an equation.
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It is √(x15), which can be simplified to approx 3.873*√x.
In the absence of a proper statement of the equation I can only guess at answers. How about (2x + 3)(3x - 5) which is the factorisation of 6x2 - x - 15 = 0? In which case x = -2/3 or 5/3.
240 square feet
36 x15 180 360 540
28 x15 140 280 420