How do you evaluate #a^4 – b^2# if a = 3 and b = 9? Algebra Expressions, Equations, and Functions Variable Expressions 1 Answer Veddesh #phi# · George C. Jan 4, 2016 #a^4-b^2=0# Explanation: #Given,# #a=3,b=9# #Then,a^4=3*3*3*3=81# #b^2=9*9=81# #So,81-81=0# 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 1481 views around the world You can reuse this answer Creative Commons License