how do I solve this problem?
Using the quadratic equation x2 – 4x – 5 = 0, perform the following tasks:
(THAT above is x to second power)
Solve by using the quadratic formula
2007-02-23 10:51:43 · 4 answers · asked by donmigeul 2 in Science & Mathematics ➔ Mathematics
usually u would just factor it to (x-5)(x+1)
answers are 5, -1
using quad. formula u do
( 4 +/- root| 16 + 20 ) / 2
(4 +/- 6) / 2
answers are 10 /2 and -2 /2
= 5 , -1
2007-02-23 11:03:31 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Rob M got it right.
One extra step at the start:
The formula is written in the form
a*x^2 + b*x + c = 0
In this case, a = 1, b = -4 and c = -5
Continue, using Rob M's posting.
2007-02-23 11:04:14 · answer #2 · answered by Raymond 7 · 0⤊ 0⤋
use this formaula
a=1 b= -4 c= -5
using quadratic formula
x= (-b ± √b2 – 4ac)/2a
2007-02-23 11:20:24 · answer #3 · answered by Anonymous · 0⤊ 0⤋
applying the formula
x=(-b+/-sqrt(b^2-4ac))/2a
x=(4+ or -sqrt((-4)^2-4(1)(-5)))/2*1
x=(4 + or -sqrt(16+20))/2
x=(4+ or -6)/2
x=5, -1
2007-02-23 10:59:13 · answer #4 · answered by Rob M 4 · 1⤊ 0⤋