Question

Tolong bantu jawab dong..
Pake caranya juga yaa

A. x(3x - 1) - 2x (x + 1) = 0

B. 21 - 8x - 4x² = 0

C. x(x - 3) = 0

Answer 1

A.

x(3x - 1) - 2x (x + 1) = 0

3x² - x - 2x² -2x = 0

3x² - 2x² - x - 2x = 0

x²-3x = 0

x (x-3) = 0

x = 0 atau x = 3

B.

21 - 8x - 4x² = 0

(7 + 2x) (3 - 2x) = 0

7 + 2x = 0 atau 3- 2x =0

2x = -7 atau 2x = 3

x = -7/2 atau x = 3/2

C.

x(x - 3) = 0

x = 0 atau x = 3

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