Solution - Simplification or other simple results

Step  1  :

Step  2  :

Pulling out like terms :

 2.1    Simplify ( -8x-7 )²

Put the exponent aside and simplfy the base by pulling out like factors :
 -8x-7  =  -1 • (8x+7) 

Remember the 4th law of exponents : (a • b)^m= a^m• b^m

Retract the exponent and apply the 4th law to the simplified base: ( -1 • (8x+7) )² =  (-1)² • (8x+7)²  

Final result :

  (8x + 7)2