Math (3 of 3) *Final*

8. Factor 5t² - t -18

9. Factor 25x² - 9

10. Factor 9t² + 12t + 4

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asked by D
  1. See https://www.jiskha.com/display.cgi?id=1522693893#1522693893.1522695283

  2. Factoring takes some practice.
    (5t-?)(t+?)
    or (5x+?)(t-?) so just play around and you will finally wind up with
    10-9=1, so
    (5t+9)(t-2) = 5t^2+9t-10t-18 = 5t^2-t-18

    also, recall that (a-b)(a+b) = a^2-b^2
    25x^2-9 = (5x)^2 - 3^2

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    posted by Steve
  3. 10. remember 3*2 = 6
    6+6 = 12

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    posted by Damon

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