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dsp73
3 years ago
9

X^2 - 4x = (x-2)^2 - 4. How is this?​

Spanish
1 answer:
Svetradugi [14.3K]3 years ago
3 0

Answer:

x ∈ R(0=0)

Explanation:

Se la expresión (a-b)^{2}=a^{2}-2ab+b^{2}

x^{2}-4x=(x-2)^{2}-4\\x^{2}-4x=x^{2} -4x+4-4\\0 -4x=-4x+4-4\\0=4-4\\0=0

La posición es verdadera para cualquier valor de X.

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