x²+3x = 324 then find x
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Step-by-step explanation:
x² + 3x = 324
x= (-b±√b²-4ac) / 2a
comparing Equation 1 with ax²+bx+c
a= 1 , b = 3 , c= -324
x = (-3±√9-4×1×-324) / 2
x = (-3 ±√1305 ) / 2
x= 16.56 or x= -19.56
Breadth cannot be negative
x = breadth = 16.56
length = x+3 = 19.56
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