Question 810810
a) (x+4)(x-3)=78

b)

solving:   (x+4)(x-3)=78

x^2+x-12 = 78

x^2+x -90= 0

(x-9)(x+10) = 0

x = 9 or x = -10

since x must be > 0

x = 9 

Length = x+4 = 13
width = x-3 = 6

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