How do you evaluate the expression #2x^2+3x+9# if x=-3? Algebra Expressions, Equations, and Functions Variable Expressions 1 Answer smendyka Dec 6, 2016 #18# Explanation: You substitute #-3# for every occurrence of #x# in the expression and then calculate the result. Be sure to handle the signs of numbers correctly: #2(-3^2) + 3(-3) + 9 -># #(2*9) - 9 + 9 -># #18 - 0 -># #18# Answer link Related questions How do you write the variable expression for: a quotient of 2 and the sum of a number and 3 ? What are variables? What are variable expressions? How do you write variable expressions? How do you evaluate variable expressions? How do you simplify the expression #3x-x+4#? How do you write a quotient of a number and 6 as an expression? How do you evaluate the expression #2x+1# for #x=1#? How do you write a product of a number and 2 as an expression? How do you write 5 less than 2 times a number as a variable expression? See all questions in Variable Expressions Impact of this question 1748 views around the world You can reuse this answer Creative Commons License