Solve by using Quadratic Formula: 3x^2 - 5x - 7 = 0

marshall1432

Banned
Joined
Jan 10, 2007
Messages
80
Solve by using the quadratic formula :
3x'2squared' - 5x-7=0

WORK DONE :

A= 3, B= 5 C=7

x=5+- (-5)2-4(3)(7)
----------
2(3)
x=5+- }25-84
------
6

x=5+- 59
---
6
x=5+-]-59
----
6 thats what i got as my answer.
 

Subhotosh Khan

Super Moderator
Staff member
Joined
Jun 18, 2007
Messages
18,134
Re: Solve by using the quadratic formula :

marshall1432 said:
Solve by using the quadratic formula :
3x'2squared' - 5x-7=0

WORK DONE :

A= 3, B= -5 C= -7 <--- Watch those signs!!!

x=5+- (-5)2-4(3)( -7)
----------
2(3)
x=5+- }25 + 84 <-- watch those signs and fix accordingly
------
6

x=5+- 59
---
6
x=5+-]-59
----
6 thats what i got as my answer.
 
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