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yg lainnya salah
dan itu ga ada dipilhannya
=4x^2+8x-4x-8
=4x^2+4x-8... salah
2.4x^2-25=(2x-5)(2x+5)
=4x^2+10x-10x-25
=4x^2-25..... benar
3.x^2-4=(x-2)(x+2)
=x^2+2x-2x-4
=x^2-4....... benar
4.x^2-4x=x(x-2)
=x^2-2x ....salah
Yg benar 2&3.. d soal kamu tambahkan pngkat 2 d huruf X yg pertama...