• anonymous
There are some binomials that can be expanded directly by a general inspection. For example (x+a)(x+b)=x^2+x(a+b)+ab. Can you help me to recognize to which case does the following expression belongs to? (3x+7)(7x-3)
  • Stacey Warren - Expert
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  • schrodinger
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  • anonymous
I found the answer guys :)
  • radar
Did you expand it by inspection? Or did you use paper & pencil?
  • anonymous
after a while, FOILing with small numbers becomes easy in the example above, you would do I'm not sure where i learned this from, or maybe i came up with it (i'm definitely not the first to do so!) (ax + b)(cx + d) (a*b)x^2 + (bc + ad)x + bd it's really just a "formula" for FOIL so your example (3x+7)(7x-3) (3 * 7)x^2 + (49 + -9)x + -21 21x^2 + 40x - 21

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