Respuesta :
Answer:
(x² - 8x + 16) = (x-4) (x-4)
Step-by-step explanation:
We have to factorize the given expression
(x²-8x+16)
(x² - 8x + 16 ) = x² - 2(4x) + 4²
= ( x-4)²
[As we know (a-b)² = a² + b² - 2ab]
so (x² - 8x + 16) = (x-4) (x-4) is the factored form of the given expression.
Here we need to see which factored expression is equivalent to the polynomial x^2 - 8x + 16.
We will find that the correct option is: (x - 4)^2
Now let's see how to get this.
Remember the expansion:
(x + a)^2 = x^2 + 2*a*x + a^2
In our polynomial x^2 - 8x + 16 we can see that the second term is negative, thus we must have something like:
(x - a)^2 = x^2 - 2*a*x + a^2
Also the constant digit is 16, then:
a^2 = 16
a = √16 = 4
Thus the polynomial is: (x - 4)^2
Expanding this we get:
(x - 4)^2 = x^2 - 2*4*x + 16 = x^2 - 8*x + 16
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