anonymous
  • anonymous
How do you do this ? Solve the equation: 4x2 = 36 A. {6, -6} B. {3, -3} C. {2/3, -2/3} D. {3/2, -3/2}
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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Callisto
  • Callisto
4x2 = 36 4x2 -36 =0 Factorise it, put each factor =0, and solve it, try ~
anonymous
  • anonymous
B
anonymous
  • anonymous
so 6,-6 ?

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Callisto
  • Callisto
you also can take out the common factor first... i meant the '4'
Callisto
  • Callisto
nope..
Callisto
  • Callisto
factorise 4x2 -36 first
anonymous
  • anonymous
so i need to find the GCF of 36 ?
Callisto
  • Callisto
36 and 4x^2
anonymous
  • anonymous
4 .
anonymous
  • anonymous
is the GCF
Callisto
  • Callisto
yes.. so you can rewrite it into 4(x^2-9), so now, factorise (x^2 -9)
anonymous
  • anonymous
2/3 ?
Callisto
  • Callisto
nope...
Callisto
  • Callisto
factorise (x^2 -9)
anonymous
  • anonymous
thats what i got. its either that or 3/2
Callisto
  • Callisto
\[x^2 -9 = (x-3)(x+3)\]
anonymous
  • anonymous
so So if i do the square root of nine and times the answer two times that will give me my answer ?
Callisto
  • Callisto
4x2 -36 =0 4(x^2 -9) =0 4(x+3)(x-3) =0 (x+3)(x-3) =0 x+3 =0 or x-3 =0 x=-3 or x=3
Callisto
  • Callisto
no, \[\sqrt{9} \times 2 = 3\times2 = 6\]
anonymous
  • anonymous
ok
Callisto
  • Callisto
do you understand?
anonymous
  • anonymous
yes

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