Answer:6
Explanation:
there is a law for that:
5*12=x*(x+4)
60=x*x+4x
x*x+4x-60=0
(x+2)*(x+2)-64=0
(x+2)(x+2)=8*8
x+2=8
x=6
Step-by-step explanation:there is a law for that:5*12=x*(x+4)60=x*x+4xx*x+4x-60=0(x+2)*(x+2)-64=0(x+2)(x+2)=8*8x+2=8x=6
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