4(x+7) becomes 4x+28 you multipli the 4 in parentheses ans 2(x+7) becomes 2x+14
4x+28=2x+14 you move the x termes to the left and other numbers to the right look:
4x-2x=14-28 when you change the sides always change the sign +or-
2x=-14
2x/2=-14/2
X=-7
Answer:
speed is 240 miles per hour
Step-by-step explanation:
(a + 2b) • (a2 - 2ab - 4b2)
Answer:
1/2
Step-by-step explanation:
3x^-2 can be written
3/x^2 because x^-2 is = 1/x^2
