Mean proportional

If x+7 is the mean proportional between (x+3) and (x+12), find the value of x .

Correct answer:

x =  13

Step-by-step explanation:

x+7 = (x+3) (x+12)  (x+7)2 = (x+3) (x+12) x2+14x +72 = x2+3x+12x+3 12  14x+49=3x+12x+36  14 x+49=3 x+12 x+36  x=13  x=113=13  x=13



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