Question

Expand using formula (9a + 5)^2​

Answer 1

Answer:

81a²+90a+25

Step-by-step explanation:

(9a+5)²

{applying (a+b)²=a²+b²+2ab}

(9a)²+(5)²+2×9a×5

81a²+25+90a

81a²+90a+25

Answer 2

Step-by-step explanation:

We use the formula,

(a+b)² = a² + 2ab + b²

So now,

(9a + 5)² = (9a)² + 2(9a)(5) + (5)²

= 81a² + 90a + 25