Question

1. $(4n - 5)^2 =$

Explanation:

Step1: Apply square of binomial rule

Recall the formula $(a-b)^2 = a^2 - 2ab + b^2$, where $a=4n$, $b=5$.

Step2: Calculate each term individually

$a^2=(4n)^2=16n^2$, $2ab=2\times4n\times5=40n$, $b^2=5^2=25$

Step3: Substitute terms into formula

$16n^2 - 40n + 25$

Answer:

$16n^2 - 40n + 25$