X² + 4x - 21 = 0 answer and solution? please help me

x = -7, 3

General Formulas and Concepts:

Order of Operations: BPEMDAS

Standard Form: ax² + bx + c = 0

Step-by-step explanation:

Step 1: Define

x² + 4x - 21 = 0

Step 2: Solve for x

Step 3: Check

Plug in x to verify it's a solution.

Step-by-step explanation:

x² + 4x - 21 = 0

Using the quadratic formula which is

From the question

a = 1 , b = 4 , c = - 21

We have

So we have

We have the final answer as

Hope this helps you

correct answer is infinitely many solutions

step-by-step explanation:

2(2x + 3) = -4 + 2(2x + 5)

solving the above equation:

4x + 6 = -4 +4x +10

combining like terms

4x -4x = -4+10-6

0=0

since both sides are 0=0, we end up into true statement it means it has infinite many solutions.

so correct answer is infinitely many solutions