please help and oh, i'm stuck with this one too : 135= 180(n-2)/n (how to find n)
answer soon
can someone solve this equation, 2x^2 + 12x+ 40= 360?
2009-03-14 10:14 am
回答 (7)
2009-03-14 10:39 am
✔ 最佳答案
2x^2+12x+40-360=02x^2+12x-320=0
x^2+6x-160=0
(x+16)(x-10) =0
x+16=0 x-10=0
x=-16 x=10 x={-16,10} answer//
135=180(n-2)
.......-------------
...........n
135n=180n-360
135n-180n=-360
-45n=-360
n=8 answer//
2009-03-14 10:24 am
ya sure.. the first answer is x = -16, 10
u can divide the whole thing by 2 and then factorise... if u cant get don hesitate to contact me..
135/180 = (n-2)/n
135/45 = (n-2)/2
3 = (n-2)/2
n-2 = 6
n = 8
u can divide the whole thing by 2 and then factorise... if u cant get don hesitate to contact me..
135/180 = (n-2)/n
135/45 = (n-2)/2
3 = (n-2)/2
n-2 = 6
n = 8
2009-03-14 10:24 am
Divide bothsides to 2,then x^2+6x-160=0
then (x-10)(x+16)=0,x=10 & x=-16
==================================================
135n=180n-360
360=45n
n=8
then (x-10)(x+16)=0,x=10 & x=-16
==================================================
135n=180n-360
360=45n
n=8
2009-03-14 11:45 am
1)
2x^2 + 12x + 40 = 360
x^2 + 6x + 20 = 180
x^2 + 6x + 20 - 180 = 0
x^2 + 6x - 160 = 0
x^2 + 16x - 10x - 160 = 0
(x^2 + 16x) - (10x + 160) = 0
x(x + 16) - 10(x + 16) = 0
(x + 16)(x - 10) = 0
x + 16 = 0
x = -16
x - 10 = 0
x = 10
∴ x = -16 , 10
= = = = = = = =
2)
135 = 180(n - 2)/n
135n = 180(n - 2)
135n = 180*n - 180*2
135n = 180n - 360
135n - 180n = -360
-45n = -360
n = -360/-45
n = 8
2x^2 + 12x + 40 = 360
x^2 + 6x + 20 = 180
x^2 + 6x + 20 - 180 = 0
x^2 + 6x - 160 = 0
x^2 + 16x - 10x - 160 = 0
(x^2 + 16x) - (10x + 160) = 0
x(x + 16) - 10(x + 16) = 0
(x + 16)(x - 10) = 0
x + 16 = 0
x = -16
x - 10 = 0
x = 10
∴ x = -16 , 10
= = = = = = = =
2)
135 = 180(n - 2)/n
135n = 180(n - 2)
135n = 180*n - 180*2
135n = 180n - 360
135n - 180n = -360
-45n = -360
n = -360/-45
n = 8
2009-03-14 10:54 am
x^3=13.3
this simplified is
4.43
this simplified is
4.43
2009-03-14 10:32 am
2x² + 12x + 40 = 360
2x² + 12x + 40 - 360 = 0
2x² + 12x - 320 = 0
x² + 6x - 160 = 0
(x - 10)(x - 16) = 0
x - 10 = 0 OR x - 16 = 0
x = 10 OR x = 16
135 = 180(n - 2) / n
135n = 180(n - 2)
135n = 180n - 360
135n - 180n = -360
-45n = -360
45n = 360
n = 360 / 45
n = 8
2x² + 12x + 40 - 360 = 0
2x² + 12x - 320 = 0
x² + 6x - 160 = 0
(x - 10)(x - 16) = 0
x - 10 = 0 OR x - 16 = 0
x = 10 OR x = 16
135 = 180(n - 2) / n
135n = 180(n - 2)
135n = 180n - 360
135n - 180n = -360
-45n = -360
45n = 360
n = 360 / 45
n = 8
收錄日期: 2021-05-01 12:12:27
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