The area of a triangle is 16 square units. the base of the triangle is x+4. the height of the triangle is x. find x.

The area of triangle formula is A = B*H  / 2
so it means 16 square = (x+4) x /2
so x²+4x -32=0, D' = 2²- (-32)= 36, sqrt of D' = 6
so x = -2 -6 = -8 or x= -2 +6 = 4
x must be positive so x = 4

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