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  • Created by: Elca
  • Created on: 12-03-15 19:54
  • formula is a rule which links a variable to one or more other variables. 
  • The variables are written in shorthand by representing them with a letter. 
  • Substitution involves replacing the letters in a given formula or expression with numbers. 


Find the value of the expression 2a^3 + b when a = 3 and b = 5. 

Replace the letters with the…


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