MATH!!!! Help Please Algebra 1 high school...? Homework...Can anyone like help me understand them better?

Question

a-1/2b3 when a= 1/3 and b= -2/3 Whats any easy way to understand this? And the 3 by b is cubed.. And a couple more 8- (x2) - (y3) when x= -3 and y = 6

Answer 1

try just plugging in the numbers and continuing the problem as if it were a regular problem.

for ex.

a-1/2b^3

(1/3)-(1/2)(-2/3)^3

(1/3)-(1/2)(-8/27)

(1/3)-(-8/54)       ------    -(-8/54) = +(4/27)

(1/3)+(4/27)

get them to have the same denominator.    1/3= 9/27

(9/27)+(4/27)

13/27

the answer is 13/27

Answer 2

Well i always go here when i need help in Algebra

http://www.webmath.com/index.html

Answer 3

Just plug the numbers back into the equation and if you have a graphing calculator like a T-(which ever model) just plug the equation straight into it and it will give you the answer....