Answer:
[tex]-17x - 19x^4 - 21x^2 = -1779[/tex] when [tex]x = 3[/tex]
Step-by-step explanation:
Given
[tex]-17x - 19x^4 - 21x^2[/tex]
[tex]x = 3[/tex]
Required
Solve
Substitute 3 for x in [tex]-17x - 19x^4 - 21x^2[/tex]
[tex]-17x - 19x^4 - 21x^2 = -17*3 - 19*3^4 - 21*3^2[/tex]
Evaluate all exponents
[tex]-17x - 19x^4 - 21x^2 = -17*3 - 19*81 - 21*9[/tex]
[tex]-17x - 19x^4 - 21x^2 = -51 - 1539- 189[/tex]
[tex]-17x - 19x^4 - 21x^2 = -1779[/tex]
