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11 August, 15:28

Match the missing term with the perfect square trinomial 9X^2+?+25

49

6x

36

30x

+1
Answers (1)
  1. 11 August, 15:46
    0
    9x^2+t+25 = (ax+b) ^2

    9x^2+t+25=a^2*x^2+2abx+b^2 so

    a^2=9 so a=3

    b^2=25 so b=5 then

    t=2ab using a and b from above

    t=2*3*5=30

    So the missing term is 30x
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