Math Problem Statement
a) bestem f '(x): ;
"f(x) = ax^3 + 5*x^2 + 2*x + 1"
så differentiere vi funktionen:
"f(x) = (ax^3 + 5*x^2 + 2*x) + 0"
"= ax^(3)+5 x^(2)+2 x"
=ax^(3)+5 x^(2)+2 *1;
NULL;
"= ax^(3)+5 x^(2)+2 "
=a3 x^(2)+52 x^(1)+2 ;
=a3 x^(2)+52 x^()+2 ;
=a*3 x^(2)+10 x+2 ;
=3 a x^(2)+10 x+2 ;
"f '(x)= 3 ax^(2)+10 x+2 "
"b) bestem a `sᅢᆬ` f '(1) = -3 "
vi ved at
f '(1) = -3, derfor;
:
"f '(x)= 3*a*x^(2)+10 x+2 "
f '(1)= 3ax^(2)+10 x+2;
f '(1)= 3a1^(2)+10 *1+2;
f '(1) =-3= 3a1^(2)+10 *1+2;
så isolere vi bare a:
-3 = (3a1^2 + 10) + 2;
"-3 - 2 = 3*a*1^2 + 10"
-5 = 3a1^2 + 10;
-5 = 3a1^2 + 10;
-5 - 10 = 3a1^2;
-15 = 3a1^2;
-15 = 3*a;
-15 = 3*a;
(-15)/3 = (3*a)/3;
-5 = a;
-5=a, når
f '(1) = -3 ;
Solution
Ask a new question for Free
By Image
Drop file here or Click Here to upload
Math Problem Analysis
Mathematical Concepts
Differentiation
Polynomials
Solving for unknowns
Formulas
f'(x) = d/dx (ax^3 + 5x^2 + 2x + 1)
f'(1) = 3a(1^2) + 10(1) + 2
Theorems
Basic rules of differentiation
Suitable Grade Level
Grades 11-12