Question

Tìm x:[(6x^2-12)÷3]×16=64

Answer 1

[(6x² - 12) : 3] . 16 = 64

(6x² - 12) : 3 = 64 : 16

(6x² - 12) : 3 = 4

6x² - 12 = 4 . 3

6x² - 12 = 12

6x² = 12 + 12

6x² = 24

x² = 24 : 6

x² = 4

x = 2 hoặc x = -2

Answer 2

\(\left[\left(6x^2-12\right):3\right]\times16=64\\ \left(6x^2-12\right):3=4\\ 6x^2-12=12\\ 6x^2=24\\ x^2=4\\ x^2=2^2\\ x=2.\)