Giovanni justifies whether the expression -4x-8 is equivalent to -2(x+1)-2(x+3)by letting x=3 in both expressions. What is the value of each expression when x=3
For this case we have the following expressions: -4x-8 -2 (x + 1) -2 (x + 3) Evaluating x = 3 in both expressions we have: -4 (3) -8 = -12 - 8 = -20 -2 (x + 1) -2 (x + 3) = -2 (3 + 1) -2 (3 + 3) = -2 (4) -2 (6) = -8-12 = -20 Answer: the value of each expression when x = 3 is: -20 and -20
