The area of a rectangle is given by the equation y=x2−9x+14. If the area is 50 square units, what is the value of x? Remember that length must be positive.

Question

I need help plz 

Answer 1

x^2 - 9x + 14 =50

subtract 50 from each side: x^2 - 9x -36 = 0

this factors as (x+3)(x-12) = 0

the root -3 makes no physical sense

but x = 12 is correct