(m+5)^3 - (m-2)^3
**10 points right away for the right answer!**
= (m + 5)³ - (m - 2)²
= m³ + 15m² + 75m + 125 - (m³ - 6m² + 12m - 8)
= m³ + 15m² + 75m + 125 - m³ + 6m² - 12m + 8
= 21m² + 63m + 133
= 7(3m² + 9m + 19)
Answer: 7(3m² + 9m + 19)
Solve the brackets, then complete the problem:
= (m^3 + 125) - ( m^3 - 8)
= 117 (m's cancel eachother out and 125 - -8 = 117)
:P
did i get it right?
You are not allowed to distribute the cubed you have to completely expand both sets of parentheses.
=m^3+15m^2+75m+125-m^3+6m^2-8m+8
=21m^2+67m+133
distribute so m^3+5^3 - m^3-2^3 now simplify
m^3-125(5*5*5) -m^3- 8 (2*2*2)
combine like terms....m^3-m^3 is zero and 125-8 is 117 and there's your answer
F(c)k=S(e)^X=8==D~o~o~o Problem solved
21m^2+63m+133
(m = -125)(m + -50/21)
Comments
= (m + 5)³ - (m - 2)²
= m³ + 15m² + 75m + 125 - (m³ - 6m² + 12m - 8)
= m³ + 15m² + 75m + 125 - m³ + 6m² - 12m + 8
= 21m² + 63m + 133
= 7(3m² + 9m + 19)
Answer: 7(3m² + 9m + 19)
Solve the brackets, then complete the problem:
(m+5)^3 - (m-2)^3
= (m^3 + 125) - ( m^3 - 8)
= 117 (m's cancel eachother out and 125 - -8 = 117)
:P
did i get it right?
You are not allowed to distribute the cubed you have to completely expand both sets of parentheses.
=m^3+15m^2+75m+125-m^3+6m^2-8m+8
=21m^2+67m+133
distribute so m^3+5^3 - m^3-2^3 now simplify
m^3-125(5*5*5) -m^3- 8 (2*2*2)
combine like terms....m^3-m^3 is zero and 125-8 is 117 and there's your answer
F(c)k=S(e)^X=8==D~o~o~o Problem solved
21m^2+63m+133
(m = -125)(m + -50/21)