FACTORISATION {4+(2x+3)} {4-(2x+3)}
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{4+(2x+3)} {4-(2x+3)}=0
(4)^2-(2x+3)^2=0
16-4x^2-9-12=0
-4x^2-5=0
4x^2= -5
x^2= -5/4
x= root -5/2
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