factorise x square - 84 is equal to zero
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Hey
x^2-84=0
=>x^2 = 84
=> x= +√84 and x=-√84
=> x= 2√21 and x= -2√21
Hope it helps :)
x^2-84=0
=>x^2 = 84
=> x= +√84 and x=-√84
=> x= 2√21 and x= -2√21
Hope it helps :)
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