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=4x²+6x+6x+9
=4x²+12x+9
*Good luck*
caranya :
a. Pertama × pertama = 2x × 2x = 4x²
b. Luar × luar = 2x × 3 = 6x
c. Dalam × dalam = 3 × 2x = 6x
d. Akhir × akhir = 3 × 3 = 9
dijumlahkan
= 6x + 4x² + 6x + 9
= 4x² + 12x + 9