anonymous
  • anonymous
Can someone explain how to do (x + 3)(x - 7)?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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jim_thompson5910
  • jim_thompson5910
first set up a 2x2 table |dw:1377719725861:dw|
jim_thompson5910
  • jim_thompson5910
at the top, we'll put the terms from x+3 |dw:1377719803091:dw|
jim_thompson5910
  • jim_thompson5910
off to the left, we'll put the terms from x-7 |dw:1377719830693:dw|

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jim_thompson5910
  • jim_thompson5910
to fill out this table, you multiply the terms in the headers for instance, to fill out this cell here (with a circle in it) |dw:1377719877013:dw| you multiply the circled terms x and 3 to get 3x and 3x goes in that cell |dw:1377719901348:dw|
anonymous
  • anonymous
x(x) = x (first box), x(3) = 3x (second box), -7(x) = -7x (third box),-7(3) = -21 (fourth box).
jim_thompson5910
  • jim_thompson5910
x times x is not x x times x is x^2
jim_thompson5910
  • jim_thompson5910
fill out the table to get this |dw:1377720026615:dw|
anonymous
  • anonymous
Oops, okay.
jim_thompson5910
  • jim_thompson5910
now you combine like terms
anonymous
  • anonymous
x^2 - 4x - 21
jim_thompson5910
  • jim_thompson5910
very good, that's your final answer
anonymous
  • anonymous
Thank you for the help!
jim_thompson5910
  • jim_thompson5910
you're welcome

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