Solve 5a^14-20a^12 and what is the difference between poisonous and vanomous?

First Question:

5a¹⁴ - 20a¹²

Factor out 5a¹² from the expression:

5a¹² x (a² - 4)

Using a² - b² = (a -b) x (a + b), factor the expression:

5a¹² x (a - 2) x (a + 2)

Second Question:

Poisonous is something that releases toxins only after being consumed (ie a dangerous berry may be poisonous but only if you eat it).

Venomous is something that releases toxins when it bites or stings you (ie a snake biting you or a bee stinging you would both be venomous).