A very good try, but f(n) is still ambiguous. I assume you mean
f(n) = 1/2*n*(n+2) and not 1/[2*n*(n+2)]
Then f(n+2) - f(n) = 1/2*(n+2)*(n+2+2) - 1/2*n*(n+2)
= 1/2*(n+2)*(n+4) - 1/2*n*(n+2)
= 1/2*(n+2)*{(n + 4) - n}
= 1/2*(n+2)*4
= 2*(n+2)
Given a value of x, find the value for -3x + 2
"Evaluate 7a" typically means to calculate the value of the expression by substituting a specific value for the variable "a." For example, if "a" is given as 3, you would substitute it into the expression to get 7 * 3, which equals 21. If no value for "a" is provided, the expression remains as 7a.
CPUs, when given mathematical equations, apply the laws of mathematics to those equations. The equation a = a is true by the reflexive property of equality.
replace the variables with the given values and simplify using the order of operations.
It would help if the expression was given!
explain how to evaluate an algebraic expression for given variables. how would we evaluate the expression "3x-4y+9" when x=2and y=5?
Take 3 and substitute into the expression given to you but not mentioned in the question here and evaluate the expression. "Sub and Solve" I say.
14
Given a value of x, find the value for -3x + 2
To evaluate an expression is nothing but to operate the given expression according to the operators given in the expression if it is evaluable i.e, it could be convertable.
"Evaluate 7a" typically means to calculate the value of the expression by substituting a specific value for the variable "a." For example, if "a" is given as 3, you would substitute it into the expression to get 7 * 3, which equals 21. If no value for "a" is provided, the expression remains as 7a.
-7
A variable
There is no operator given an in such cases it is often taken to be multiplication eg ab = a*b Thus 2*(-4)*(3) = -24
CPUs, when given mathematical equations, apply the laws of mathematics to those equations. The equation a = a is true by the reflexive property of equality.
You replace each variable by its value. Then you do the indicated calculations.
replace the variables with the given values and simplify using the order of operations.