1 (2×+3) ×(-2×+3y-1) 2 × kali (4×+5) 3 (×-1) × (1- ×)

1. (2x+3) x (-2x+3y-1)
= -4x²+6xy-2x-6x+9y-3
= -4x²+6xy-8x+9y-3 ✔

2. x(4x+5)
= x(4x+5x)
= 4x²+5x ✔

3. (x-1) x (1-x)
= (x-1).(-(x-1))
= - (x-1)²
= - (x²-2x+1)
= -x²+2x-1 ✔