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(x+2)^2+(2x-3)^2=4^2
x^2+4x+4+4x^2-12x-9=16
5x^2-8x-5=16
5x^2-8x-5-16=0
5x^2-8x-21=0
x+2+2x-3=4
x+2x+2-3=4
3x-1 =4
3x =4-1
3x =3
x =1
nilai mutlak itu nilai suatu bilangan riil tanpa tanda plus atau minus.