please dibantu sampai mna aj bleh kok... pkai cra kaka,soalny ini hrus di isi cara. Thx kak :-)

12.x²+8x+12
=x²+6x+2x+12
=x(x+6)+2(x+6)
=(x+6)(x+2) A

13.x²+4x-32
= x²+8x-4x-32
=x(x+8)-4(x+8)
=(x-4)(x+8) C

14.x²-x-110
=x²+10x-11x-110
=x(x+10)-11(x+10)
=(x-11)(x+10) C

15.9x²-16y²
=3²x²-4²y²
=(3x)²-(4y)²
=(3x-4y)(3x+4y) A

16.4x²-5x-6
=4x²+3x-8x-6
=x(4x+3)-2(4x+3)
=(4x+3)(x-2) C

17.5x²+17x+6
=5x²+15x+2x+6
=5x(x+3)+2(x+3)
=(5x+2)(x+3) D

18.x^4-25x²+144
=x^4-9x²-16x²+144
=x²(x²-9)-16(x²-9)
=(x²-16)(x²-9)
=(x+4)(x-4)(x+3)(x-3) No option

19.2x^4-50
=2(x^4-25)
=2(x²+5)(x²-5) (B)

Konsep dasar
a²-b²=(a+b)(a-b)
Semoga membantu ya