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Completely factor the following expression.1.)

  • algebra -

    It's got to be something of the form (ac+bd)(ec-fd) for some a, b, e and f, but 5 is a prime number, so a and e must be 5 and 1 (or the other way around), and likewise b and f. Also, the -24 can be got as -5x5 + 1, so you just need to experiment a little with the four coefficients until you get the right combination.

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