Identify the solutions to the quadratic equation

x2 + 4x-21 = 0
Check all that apply
O A. x= 3
B. X= -7
O C. x = 21
O D. x= -5
O E. x= 4

A.x=3

B.x=-7

Step-by-step explanation:

Hi, to answer this question we have to apply the quadratic formula:

For: ax2+ bx + c

x =[ -b ± √b²-4ac] /2a

Replacing with the values given:

x =[ -4 ± √(4)²-4(1)-21] /2(1)

x = [-4 ± √16 +84] /2

x = [ -4 ± √100] /2

x = [ -4 ± 10] /2

Positive:

x = [-4 + 10] /2 = 6 /2 = 3

Negative:

x = [ -4 - 10] /2 = -14/2 = -7

So, the solutions are :

A.x=3

B.x=-7

Feel free to ask for more if needed or if you did not understand something.

these sign is used to tell weather the number is greater or less than the number   <   or >     but this sign means its equal =    

hope this you and

step-by-step explanation: