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vansoffvignesh
This is the answer that i was going to upload :
the answer is +5(or)-5 because  of root
Ver imagen vansoffvignesh
irspow
(x+4)(x-4)=9  carry out multiplications on left side

x^2-16=9  add 16 to both sides

x^2=25  take the square root of both sides

x=√25

x=±5

So there are two solutions x=-5 and 5