keyvon keyvon
  • 24-07-2017
  • Mathematics
contestada

please help me ? (×+3)(×-3)

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texaschic101
texaschic101 texaschic101
  • 24-07-2017
(x + 3)(x - 3) = x^2 - 3x + 3x - 9 = x^2 - 9 <=
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laurennz
laurennz laurennz
  • 24-07-2017
You would use the method called FOIL.
First
Outer
Inner
Last
The first are x and x, so you would do x times x which is x^2. Next are the outers, which are -3 and x, so you multiply those together to get -3x. The inbred are 3 and x, multiply those together to get 3x. The lasts are 3 and -3, multiply those together to get -9. Now your equation is x^2 -3x +3x -9, simplify this to get x^2 -9
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