Seudónimo Seudónimo
  • 14-05-2017
  • Mathematics
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Solve this equation using an algebraic method: (x + 4)( x - 4) = 9

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vansoffvignesh
vansoffvignesh vansoffvignesh
  • 14-05-2017
This is the answer that i was going to upload :
the answer is +5(or)-5 because  of root
Ver imagen vansoffvignesh
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irspow
irspow irspow
  • 14-05-2017
(x+4)(x-4)=9  carry out multiplications on left side

x^2-16=9  add 16 to both sides

x^2=25  take the square root of both sides

x=√25

x=±5

So there are two solutions x=-5 and 5
Answer Link

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