Question

w.4 add and subtract polynomials
subtract.
$(2n + 9) - (n + 7)$

Explanation:

Step1: Distribute the negative sign

$2n + 9 - n - 7$

Step2: Combine like terms for $n$

$2n - n = n$

Step3: Combine constant terms

$9 - 7 = 2$

Step4: Combine results

$n + 2$

Answer:

$n + 2$