Question

1. $5m^{2}+2-7m-7m^{2}-1$

Explanation:

Step1: Group like terms

$5m^2 -7m^2 -7m +2 -1$

Step2: Combine quadratic terms

$(5-7)m^2 -7m +(2-1) = -2m^2 -7m +(2-1)$

Step3: Combine constant terms

$-2m^2 -7m +(2-1) = -2m^2 -7m +1$

Answer:

$-2m^2 -7m +1$