Question

if x²+2x = 15 . Find the natural number represented by x .
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Answer 1

Answer:

3

Step-by-step explanation:

x²+2x = 15

x²+2x - 15= 0

x²+5x-3x-15=0

x(x+5)-3(x+5)= 0

(x+5)(x-3) = 0

x+5= 0 or x-3= 0

x= -5 or x= 3

3 is the natural number represented by x.