???Can someone please help me???
*** 8th grade ***
MATH

by Pythagoras' theorem

a²+b²=c²

look to the figure

hight+ base= perpendicular

base has 4 row blocks

hight has 3 row blocks

similarly perpendicular has 5 row blocks

apply formula you will get

3²+4²=5²

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.