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3.

x( x + 10) = 3(5x – 2)

x² + 10x = 15x – 6

x² + 10x – 15x + 6 = 0

x² – 5x + 6 = 0

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

>> x – 2 = 0

x = 2

>> x – 3 = 0

x = 3

4. (x + 2)² = 2x + 3

(x + 2) (x + 2) = 2x + 3

x² + 4x + 4 = 2x + 3

x² + 4x – 2x + 4 – 3 = 0

x² – 2x + 1 = 0

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

>> x – 1 = 0

x = 1

>> x – 1 = 0

x = 1

Jawaban:

3. x² = 5x – 6

Penjelasan dengan langkah-langkah:

3.

x(x + 10) = 3(5x – 2)

x² + 10x = 15x – 6

x² = 15x – 10x – 6

x² = 5x – 6