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=(x-4)(x-4)
=x(x-4) -4(x-4)
=x^2 -4x -4x +16
=x^2-8x+16
2) (2x+3)^2
=(2x+3)(2x+3)
=2x(2x+3) +3(2x+3)
=4x^2 +6x +6x+9
=4x^2 +12x + 9
diteliti lagi yah :)