Both solutions separated by a comma!!!
Please Help!
2007-05-19 19:47:49 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
For about the "a" its a miss print!!!
Solve for x by both soultions, seperated by a comma.
Please HELP!
2007-05-19 19:49:34 · update #1
You need to factor it, and then set each factor to zero to solve for each x that will make this statement correct. Like this:
(7x + 9)(x - 1) = 0
7x + 9 = 0 ======> x = -9/7
x - 1 = 0 =======> x = 1
You can check each answer by substituting each x back into the original equation to make sure they both give zero.
This website has a lot of math help on it, and it is easy to understand: www.sosmath.com.
2007-05-19 20:01:27 · answer #1 · answered by T_Rae 3 · 0⤊ 0⤋
7x^2 + 2x - 9 = 0 can be factored as
7x + 9 and x - 1 thus giving us x = - 9/7 and x = 1 as the two factors.
2007-05-20 02:55:14 · answer #2 · answered by Swamy 7 · 1⤊ 1⤋
7x^2 + 2x-9=0 ==> factors to
(7x-1)(x+9) = 0
7x-1 = 0 OR x+9 = 0
x = 1/7 OR x = -9
=]
good luck!
...
2007-05-20 02:59:00 · answer #3 · answered by Anonymous · 0⤊ 0⤋
7x^2 + 2x - 9 = 0
Use quadratic formula to solve for x
x =( -b +/- sqrt b^2 - 4ac)/2a
a = 7
b = 2
c = - 9
x = (-2 +/- sqrt (2)^2 - 4(7)(-9))/2(7)
x = (-2 +/- sqrt 4 + 252)/14
x = (-2+/1 sqrt 256)/14
x = (-2 +/- 16)14
x = (-2 + 16)14 and (-2 - 16)14
x = 14/14 = 1 and -18/14 = -9/7
x = 1, -9/7 ==> answers
2007-05-20 03:03:37 · answer #4 · answered by detektibgapo 5 · 0⤊ 0⤋
using the quadratic formula x= [-b plus-minus sqrt(b^2-4ac)]/2a with a=7, b=2, c=-9 the solutions are x=1, -9/7
2007-05-20 03:02:10 · answer #5 · answered by Anonymous · 0⤊ 0⤋
3,-1
2014-01-24 11:06:09 · answer #6 · answered by Anonymous · 0⤊ 0⤋
7x^2+2x-9=0
(7x+9)(x-1)=0
x=(-9/7) or 1
2007-05-20 03:36:00 · answer #7 · answered by Matthew T 2 · 0⤊ 0⤋
(7x+9)(x-1)=0
x=-9/7 or 1
(-9/7,1)
2007-05-20 02:55:55 · answer #8 · answered by Anonymous · 0⤊ 1⤋