Find the Discriminant 4x^2-8x=-4

$4 x^{2} - 8 x = - 4$

Step 1

Add $4$ to both sides of the equation.

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

Step 2

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

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

Step 3

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

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

Step 4

Evaluate the result to find the discriminant.

Simplify each term.

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

$64 - 4 (4 \cdot 4)$

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

Multiply $4$ by $4$ .

$64 - 4 \cdot 16$

Multiply $- 4$ by $16$ .

$64 - 64$

Subtract $64$ from $64$ .

$0$