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shelby1290
 one year ago
Determine the value(s) of k such that each trinomial is a perfect square.
a) x^2 + 4x + k
b) 4x^2  12x + k
shelby1290
 one year ago
Determine the value(s) of k such that each trinomial is a perfect square. a) x^2 + 4x + k b) 4x^2  12x + k

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shelby1290
 one year ago
Best ResponseYou've already chosen the best response.0@misty1212 half of 4 is 2

shelby1290
 one year ago
Best ResponseYou've already chosen the best response.04^24(1)(k) 164k=0 divide both sides by 4 k=4

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[164k=0 \\ \\ 16=4k \\ \\ k=?\]

shelby1290
 one year ago
Best ResponseYou've already chosen the best response.0now how about part b

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Do the same for the next one \[4x^2  12x + k=0 \\ Using \\ ax^2+bx+c=0 \\ \\ b^24ac=0\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[(12)^24(4)(k)=0\]

shelby1290
 one year ago
Best ResponseYou've already chosen the best response.014416k=0 144=16k divide both sides by 16 k=9 ?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[(12)^2= (12)(12)=12 \times 12=144\]

shelby1290
 one year ago
Best ResponseYou've already chosen the best response.0oh i see it's because i didn't put (12)^2 in brackets

shelby1290
 one year ago
Best ResponseYou've already chosen the best response.0thanks for the help though!
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