Question

Use the quadratic equation y = x^2 + 3x – 10.

Calculate the discriminant to determine the number of real roots.

A.
no solution to the equation

B.
one real root

C.
no real roots

D.
two real roots

Can someone explain how I should solve this?

Answer 1

is that x^2 + 3x - 10?

Answer 2

Yea

Answer 3

use the quadratic formula and your roots should be

x = -5
x = 2
(x+5)
(x-2)

Answer 4

I might sound dumb, but could you explain the quadratic formula as well? xD

Answer 5

I think I remember is as an equation with a^2 at the beginning?

Answer 6

ax^2*

Answer 7

Quadratic is

x = (-b +/- √(b^2 - 4ac))/(2a)
or
ax^2 + bx + c = 0

Answer 8

Quadratic Formula:

\(x = \Large\frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\)

Answer 9

So I'll plug in the numbers and make the solution?

Answer 10

0

Answer 11

For solving expressions in the form of:

\(ax^2 + bx + c\)

Answer 12

Plug in
x^2 as a
+ 3x as b
- 10 as c

Answer 13

So in this case:

a = 1

b = 3

c = -10

Answer 14

Ok

Answer 15

You will plug them into the quadratic formula and solve.

Answer 16

What kind of calculator do you have?
Is it a graphing calculator?