Find the Discriminant 4x^2-5x+8=0

$4 x^{2} - 5 x + 8 = 0$

Step 1

The discriminant of a quadratic is the expression inside the radical of the quadratic formula.

$b^{2} - 4 (a c)$

Step 2

Substitute in the values of $a$ , $b$ , and $c$ .

${(- 5)}^{2} - 4 (4 \cdot 8)$

Step 3

Evaluate the result to find the discriminant.

Simplify each term.

Raise $- 5$ to the power of $2$ .

$25 - 4 (4 \cdot 8)$

Multiply $- 4 (4 \cdot 8)$ .

Multiply $4$ by $8$ .

$25 - 4 \cdot 32$

Multiply $- 4$ by $32$ .

$25 - 128$

Subtract $128$ from $25$ .

$- 103$