FF7cloud FF7cloud

23-12-2020
Mathematics

contestada

which is the correct answer?

which is the correct answer class=

Respuesta :

ChoiSungHyun ChoiSungHyun

23-12-2020

Step-by-step explanation:

Step 3 is incorrect, it should be x - 4 + x = x(x - 3).

x - 4 + x = x(x - 3)

2x - 4 = x² - 3x

x² - 5x + 4 = 0

(x - 4)(x - 1) = 0

x = 4 or x = 1.

x = 4 is rejected as 1 / (x - 4) will become 1 / 0 which is undefined.

=> x = 1.

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