Match each step to its justification to solve 2x + 5 = 19. 2x + 5 = 19
subtract
x = 7
divide
2x/2 = 1412
given
2x = 14
Subtraction property of equality
2x + 5-5 = 19-5
division property of equality

faster, im not sure why but i know it is faster

i believe it is 2

lolll

answers

\3. yes the presentation (i.e. odd numbers being written as differences of two squares) is possible for all odd natural number however the presentation may not be unique. for example,  57=112−82=292−28257=112−82=292−282.

\4. 2 can't be written as a difference of two squares because 4-1=3 and 1-1=0 and the difference of squares grows to integers larger that 3.

can i get some in proving questions 1 and 2?