Step-by-step explanation:

Answer:
1. 12x^2 +2xy
Step-by-step explanation:
1. 12x^2 +2xy
2. 21ab^2 +35ab
3. w^2+15w+ 14
4. m^2-12m+20
5. 2k^2+5k-3
6. -r^2-5r-6
7. 8y^2+26y+15
8. -2d^2-7d-5
9. (h+6)(h-4)=0
10. s^2-7s+12=0
11. -2d^2-7d-5
Answer:

Step-by-step explanation:
we know that

so solve for x

Answer:
1) Show that the shape is a parallelogram with equal length sides
2) Show that the shape's diagonals are each others' perpendicular bisectors
3) Show that the shape's diagonals bisect both pairs of opposite angles.
Step-by-step explanation: