Answer:
17
Step-by-step explanation:
Given: 2x² – 1
when x=3
2(3)² – 1
= 2(9) -1
= 18 - 1
= 17
17 .
Step by step explanation:
Substitute the value of x into the equation and square it.
the equation then becomes 2(3)^2- 1
but 3^2 =3×3 =9
So the equation is changed to 2(9)-1 after the simplification
given you 18-1
=17
