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Question

Solve:
(1) x2+5=1
(2) 8x3=2
(3) |x|>23.

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Solution

(i) x2+5=1

x2+5=±1

x2=5±1

x=2(5±1)

=8 or 12

x=8 or x=12.


(ii) 8x3=2

8x3=±2

8x=±6

86=x

x=2 or x=14.


(iii) |x|>23

|x|23

23x23

x(,23)(23,)

x(,23)(23,).

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