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jika dijabarkan :
( 2x.2x) + 8x - 4x - 8
4x² + 4x - 8
2) 4x - 25 = (2x-5)(2x+5) = salah
jika dijabarkan :
(2x.2x) + 10x - 10x - 25
4x² - 25
3) x-4x = (x-2)(x+2) = salah
jika dijabarkan :
x² + 2x - 2x - 4
x² - 4
4) x - 4x = x(x+2)
jika dijabarkan :
x(x+2) = x² + 2x
menurut kalkulasi saya tidak ada yg benar, maaf jika salah