Which polynomial is a perfect square trinomial?

36x2 − 18x − 9
4a2 − 28a − 49
25b2 − 40b + 16
4x2 − 6x + 9

Option 3rd is correct

Step-by-step explanation:

Formula for perfect square trinomial is given by:

From the given options:

A polynomial which is a perfect square trinomial is,

Since,

We can write this as:

Apply the formula we have;

Therefore, is a perfect square trinomial

step-by-step explanation:

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15% chance.

step-by-step explanation:

3/10 times, the 5 year old will get a tablet. 5/10 times, the 13 yer old will get a tablet. multiply both fractions to get 15/100 times, both would have a tablet.