snivvles.com
  • snivvles.com
find solutions between 0 and 2pi 7 sin2x - 14 sin x + 2 = -5 will fan and medal
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
snivvles.com
  • snivvles.com
so far i've subtracted 2 from each side and divided by 7 to get sin^2x-2sinx=1
snivvles.com
  • snivvles.com
@enchanted_bubbles @Peaches15
Nnesha
  • Nnesha
divided by 7 ?? why ?

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Nnesha
  • Nnesha
this is like quadratic equation let sinx = x
Nnesha
  • Nnesha
\[\huge\rm 7x^2-14x+7=0\] now find GCF and then factor it let sinx = x
snivvles.com
  • snivvles.com
to simplify the equation, because all three numbers where divisible by 7
snivvles.com
  • snivvles.com
oh
Nnesha
  • Nnesha
ohh right you mean GCF
snivvles.com
  • snivvles.com
i got x^2 -2x=0
purplemexican
  • purplemexican
http://www.wolframalpha.com/input/?i=7+sin2x+-+14+sin+x+%2B+2+%3D+-5
Nnesha
  • Nnesha
correct so you will get \[\huge\rm \frac{ 7x^2 }{ 7}-\frac{ 14x }{ 7}+\frac{ 7 }{ 7 }=0\]
Nnesha
  • Nnesha
7/7 = ??
snivvles.com
  • snivvles.com
1
Nnesha
  • Nnesha
yes right so it's x^2 -2x +1 =0
snivvles.com
  • snivvles.com
OH right
Nnesha
  • Nnesha
after factor it ot 7(x^2-2x+1)=0 now set it equal to zero \[7\cancel{=}0 ~~~~x^2-2x+1=0\] now factor x^2-2x+1=0
snivvles.com
  • snivvles.com
ok gimme a sec
Nnesha
  • Nnesha
:=)
snivvles.com
  • snivvles.com
(x+2) (x-1)?
Nnesha
  • Nnesha
nope 2 times -1 = -2 but it suppose to be one find two number when you multiply them you should get 1 and when you add or subtract them you should get -2
snivvles.com
  • snivvles.com
(x+2)(x-1)=0
snivvles.com
  • snivvles.com
ok
Nnesha
  • Nnesha
easy method to factor quadratic equation find two number when you multiply them you should get product of AC and when you add or subtract them you should get middle term a=leading coefficient b=middle term c=constant term
snivvles.com
  • snivvles.com
hang on a sec
snivvles.com
  • snivvles.com
(x-1)^2
snivvles.com
  • snivvles.com
?
Nnesha
  • Nnesha
yep right -1 times -1 = 1 -1-1=-2
Nnesha
  • Nnesha
now change it back to sinx you get (sinx -1)^2=0 solve for sin x
snivvles.com
  • snivvles.com
I need to find the answers in between (0,2pi)
snivvles.com
  • snivvles.com
using the unit circle
Nnesha
  • Nnesha
yep so sinx -1= 0 solve for sinx sinx =1 right ? use unit circle to find radian where sinx = 1
snivvles.com
  • snivvles.com
ok that's what i thought thank you so much!
Nnesha
  • Nnesha
my pleasure!

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