Question

Determine the value of x. (x+1) (x-1)=15....​

Answer 1

Answer:

X2-x+x-1=15

x2-1=15.

X2=16

x=√16

x=4,-4

Answer 2

Answer:

$(x + 1)( x - 1) = 15 \\ {x}^{2} - {1}^{2} = 15 \\ {x}^{2} - 1 = 15 \\ {x}^{2} = 15 + 1 \\ {x}^{2} = 16 \\ {(x)}^{2} = {(4)}^{2} \\ x = 4$

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