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19. What is the value of c so that x² – 11x + c is a perfect-square trinomial? 121 –

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ignore the 121 lol
well, a perfect square is of the form (a+b)^2, which expands out to: a^2+2ab+b^2 lets compare that to what you are given x^2 –11x + c looks like a=x, and 2bx = -11x id say b = -11/2 so c = b^2
i have worked it out and i cannot find the right answer.. the choices are, 121 121 over 4 -11 over 4 121 over 2

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.... id say b = -11/2 so c = b^2 what praytell is (-11/2)^2 ?
is this completing the square?
no, -11/4 you got the /4 part right now what is (-11)^2 ?
121/4.. im pretty sure that it!
yes, that would be it :)
okay thank you soo much! XD

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