Determine which polynomial is a perfect square trinomial. 49x2 − 28x + 16 9a2 − 30a + 25 25b2 − 45b − 81 16x2 − 24x − 9

b

Step-by-step explanation:

b

9a2 − 30a + 25

Step-by-step explanation:

Perfect square trinomials follow these forms:

Notice that 25b2 − 45b − 81  and 16x2 − 24x − 9 have too many minus signs. They do not follow the form.

Notice that 49x2 − 28x + 16 would have a=7 and b=4. But 2ab should be 2*4*7=56. This does not follow the form.

Only 9a2 − 30a + 25 follows the form.

18

step-by-step explanation:

answerthe vertex form

step-by-step explanation: