## How do you know if a quadratic equation has real solutions?

If the discriminant is greater than 0, the quadratic equation has 2 real solutions. If the discriminant is equal to 0, the quadratic equation has 1 real solution. If the discriminant is less than 0, the quadratic equation has 0 real solutions.

**How do you find the number of real solutions in a quadratic equation?**

The discriminant is the expression b2 – 4ac, which is defined for any quadratic equation ax2 + bx + c = 0. Based upon the sign of the expression, you can determine how many real number solutions the quadratic equation has.

### How do you find the solution of a quadratic equation?

The discriminant of the Quadratic Formula is the quantity under the radical, b2−4ac b 2 − 4 a c . It determines the number and the type of solutions that a quadratic equation has. If the discriminant is positive, there are 2 real solutions. If it is 0 , there is 1 real repeated solution.

**Which equation shows the quadratic formula correctly to solve 7x?**

Therefore, the quadratic formula used correctly to solve 7×2 = 9 + x for x is x=1±√25314 x = 1 ± 253 14 .

## How many real number solutions does x2 16 0 have?

X^2 + 16 = 0 has no real roots since the +16 shows the parabolas vertex is above the x-axis and does not intercept it.

**How do you find the value of a quadratic function?**

The graph of a quadratic function is a parabola. The parabola can either be in “legs up” or “legs down” orientation. We know that a quadratic equation will be in the form: y = ax 2 + bx + c. Our job is to find the values of a, b and c after first observing the graph.

### How do you find the quadratic function of a parabola?

The next example shows how we can use the Vertex Method to find our quadratic function. This parabola touches the x -axis at (1, 0) only. If we use y = a(x − h) 2 + k, we can see from the graph that h = 1 and k = 0. This gives us y = a(x − 1) 2.

**What are the roots of the quadratic equation?**

We can see on the graph that the roots of the quadratic are: x = 1 (since the graph cuts the x -axis at x = 1.) Now, we can write our function for the quadratic as follows (since if we solve the following for 0, we’ll get our 2 intersection points):

## How do you find the y intercept of a quadratic function?

About Graphing Quadratic Functions 1 Find the vertex. To find x – coordinate of the vertex we use formula: So, we substitute in for and in for to get To find y – 2 Find the y-intercept. To find y – intercept plug in into the original equation: So, the y-intercept of the parabola is 3 Find the x-intercept.