How do you factorise x^2 -4 = 0?

x2 -4=0 becomes (x+2)(x-2)=0

Either one of the two brackets has the value of 0.

If the first bracket is zero, then x+2=0, therefore x=-2

If the second bracket is zero, then x-2=0, therefore x=2

Answered by Jawad C. Maths tutor

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