jazzyfa30
  • jazzyfa30
Solve the equation by using the Square Root Property. x^2 = 21 - 4x
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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hartnn
  • hartnn
do you know how to complete the square ?
jazzyfa30
  • jazzyfa30
no
hartnn
  • hartnn
x^2+4x = 21 here, the co-efficient of 'x' is 4 so, divide it by 2, and take its square, what u get ?

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More answers

jazzyfa30
  • jazzyfa30
4/2=2 square root is 1.4
hartnn
  • hartnn
we need to SQUARE the result so, 2^2 = 4 now, we add this on both sides., x^2+4x+4 = 21+4 = 25 got this ?? notice something about left side ?
jazzyfa30
  • jazzyfa30
u added 4????
hartnn
  • hartnn
yes, i added the result (here, we got 4) to both sides now notice that left side is a perfect square! isn't it ?
jazzyfa30
  • jazzyfa30
yes
hartnn
  • hartnn
x^2+4x+4 is square of what ?
jazzyfa30
  • jazzyfa30
2
hartnn
  • hartnn
4 is the square of 2 x^2+4x+4 will be square of \(\large (x+2) \\ (x+2)^2 =x^2+4x+4\) so we have \((x+2)^2=25\) take square root of both sides , what u get ?
jazzyfa30
  • jazzyfa30
x+1.4=5
jazzyfa30
  • jazzyfa30
x+2=5 my b
hartnn
  • hartnn
yes.. just put +/- in front of 5 x+2=5 or x+2=-5
hartnn
  • hartnn
can you solve those 2 easy equations ? x+2= 5....x =.. ? x+2=-5, ....x=....?
jazzyfa30
  • jazzyfa30
x=3 anx =-7
hartnn
  • hartnn
correct! good work :)
anonymous
  • anonymous
JAZZY ITS BRONX
jazzyfa30
  • jazzyfa30
hi what happenedy u not on ur regulrs account
jazzyfa30
  • jazzyfa30
Solve the equation by factoring: x2 = 18 - 3x
GoldPhenoix
  • GoldPhenoix
Does x2 = x^2 And does the = sign suppose to be a + sign?
jazzyfa30
  • jazzyfa30
sorry im still waking up x^2=18-3x
GoldPhenoix
  • GoldPhenoix
I don't think you can factor that.
jazzyfa30
  • jazzyfa30
sorry @hartnn i fell asleep i was up all night literally i didnt geta ounce of sleep until after w finished the problem we just finished
hartnn
  • hartnn
\(x^2+3x-18=0\) can you tell me 2 numbers with sum = 3 and product = -18 ?
jazzyfa30
  • jazzyfa30
6 and -3
hartnn
  • hartnn
get some rest then! you can continue in the morning ? yes! 6 and -3 are correct :)
jazzyfa30
  • jazzyfa30
it is morning hear its 8:30 am
hartnn
  • hartnn
so, split up, 3x = 6x-3x \(x^2+6x-3x-18=0\) factor out x from 1st 2 terms and -3 from last 2.....can you ?
jazzyfa30
  • jazzyfa30
(x+6)-(x-3) i think
hartnn
  • hartnn
there's no - *minus* sign \((x+6)(x-3)=0\) is correct final answer! good :)
jazzyfa30
  • jazzyfa30
oh yeah im sorry yall
hartnn
  • hartnn
and since you need to solve find x from x+6=0 and x-3=0
jazzyfa30
  • jazzyfa30
-6 andd 3
hartnn
  • hartnn
\(\large \checkmark \)
jazzyfa30
  • jazzyfa30
thank you 5 more and im going to sleep
hartnn
  • hartnn
ok! how about asking new question in new post? :)
jazzyfa30
  • jazzyfa30
i did

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