Evaluate 2x^2 - 1 when x=3

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

17

Step-by-step explanation:

Given: 2x² - 1

when x=3

2 (3) ² - 1

= 2 (9) - 1

= 18 - 1

= 17