Find the Discriminant 4x^2-8x+7=0

$4 x^{2} - 8 x + 7 = 0$

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 $c$ .

${(- 8)}^{2} - 4 (4 \cdot 7)$

Step 3

Evaluate the result to find the discriminant.

Simplify each term.

Raise $- 8$ to the power of $2$ .

$64 - 4 (4 \cdot 7)$

Multiply $- 4 (4 \cdot 7)$ .

Multiply $4$ by $7$ .

$64 - 4 \cdot 28$

Multiply $- 4$ by $28$ .

$64 - 112$

Subtract $112$ from $64$ .

$- 48$