(iv) 5x+1 X 5x-1 = 3125
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Answer:
(5x+1)(5x-1)=3125
25x²-5x+5x-1=3125
25x²-1=3125
25x²=3125+1=3126
x²=3126/25
x=√3126/25
x=22.364(app.)
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