1: 4x²-9=(2x+3)(2x-3 2:2x²+x-3=(2x-3)(x+1) 3:x²+x-6=(x+3)(x-2) 4:x²+4x-5=(x-5)(x+1)

4x^2-9= (2x+3)(2x-3)
=2x^2-6x+6x-9
=4x^2-9( benar)

2x^2+x-3= (2x-3)(x+1)
= 2x^2+2x-3x-3
=2x^2-x-3 (salah)

x^2+x-6 = (x+3)(x-2)
=x^2-2x+3x-6
=x^2-x-6 (salah)

X^2+4x-5 =(x-5)(x+1)
=x^2+x-5x-5
=x^2-4x-5 (salah juga)