# How do you use a graphing calculator to solve quadratic equations?

Oct 30, 2014

Let us look at the following example.

Solve $2 {x}^{2} + 5 x - 3 = 0$ for $x$.

(Be sure to move all terms to the left-hand side so that you have zero on the right-hand side.)

Step 1: Go to "Y=" and type in the quadratic function.

Step 2: Go to "WINDOW" to set an appropriate window size.

Step 3: Go to "CALC", and choose "zero".

Step 4: It will say "Left Bound?", so move the cursor to the left of the zero and press "ENTER".

Step 5: It will say "Right Bound?", so move the cursor to the right of the zero and press "ENTER".

Step 6: It will say "Guess?", then move the cursor as close to the zero as possible and press "ENTER".

Step 7: The zero ($X = - 3$) is displayed at the bottom of the screen.

Step 8: Repeat Step 3-7 to find the other zero ($X = 0.5$).

I hope that this was helpful.