Answer:
The perfect -square trinomial
(9y+7)²
Step-by-step explanation:
Explanation:-
Given polynomial equation
81 y² + 126 y +49
⇒ 9² y² + 2(9)(7)y + 7²
⇒ (9y)² + 2(9)(7)y +7²
we will use formula
(a+b)² = a² + 2ab +b²
⇒ (9y+7)²
Final answer:-
The perfect -square trinomial
(9y+7)²
