I just need a little explaining about this:
4 (x+y) + x
Directions: Simplify the expression and evaluate it when x = 2 and y = 5.
The back of the book says it 5x + 4x
Can someone explain how its 5x + 4x?
2007-10-11 13:33:18 · 5 answers · asked by Bluekygrrl 2 in Science & Mathematics ➔ Mathematics
4(x + y) + x
= 4x + 4y + x
= 5x + 4y
The answer is (5x + 5y), not (5x + 4x).
when x = 2, when y = 5,
5x + 4y
= 5(2) + 4(5)
= 10 + 20
= 30
2007-10-11 13:37:37 · answer #1 · answered by Anonymous · 0⤊ 0⤋
use the foil method.
4x+4y+x. the four has to be multiplied by everything in the parenthesis.
then combine like terms.
5x+4y
so i dont know why the heck the book says 5x+4x. probably a misprint
5(2)+4(5)
10+20=30
2007-10-11 13:38:28 · answer #2 · answered by Anonymous · 0⤊ 0⤋
4(x+y) + x
=4x+4y + x
= 5x +4y
When x=2 and y =5 we have
5(2) +4(5) = 10+20 = 30
2007-10-11 13:41:50 · answer #3 · answered by ironduke8159 7 · 0⤊ 0⤋
4(x+y)+x
=4x+4y+x
=5x+4y
=5(2)+4(5)
=10+20
=30
2007-10-11 13:45:42 · answer #4 · answered by Anonymous · 0⤊ 0⤋
18
2007-10-11 13:45:31 · answer #5 · answered by Jess J 1 · 0⤊ 1⤋