Math puzzle

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Across
  1. 5. Perform the indicated operation(3x)(3x-2)
  2. 6. Perform the indicated operation (2x)(3x-2)=
  3. 11. solve the functions c(x) 3x-36 at c(5)
  4. 14. Givenf(x)=2x-3 and g(x)=x²-5 find (f+g)(x)
  5. 15. is a function which is define by multiple sub_function
  6. 16. Let g(x)=2x+3 if g(a+1)
  7. 17. who is the father of math
  8. 19. is an input value of a function
  9. 20. is the way a function is written
Down
  1. 1. is the output value of function
  2. 2. &iff(x) -2x+2andg(x) x-2,then what is (f:g)(x)?
  3. 3. if f(x) 4x-3,findf(2b)
  4. 4. givenf(x) 2x-3 and g(x) x-5
  5. 7. is a relation where each element in the domain
  6. 8. the product of the function(f*g)(x) is expressed as
  7. 9. If f(x)=3x+2 and g(x) =x²+3x If f(x)2x²+3 then f(3) is equal to
  8. 10. the difference of function (f-x)is expressed as
  9. 12. Find the value of the function f(x)=[4x²-8]+2 given x=2
  10. 13. refers to the ruleof addition,subtraction multiplication and divison
  11. 18. the set of all possible values that the variable x can take is known as