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galben [10]
3 years ago
8

Write y=-3x^2+12x-21 in vertex form

Mathematics
2 answers:
tensa zangetsu [6.8K]3 years ago
6 0
The vertex form of any function is : <span>f(x) = a(x-h)^2 + k
 Hence the correct option would be: A): "</span><span>-3(x-2)^2-9</span>"
riadik2000 [5.3K]3 years ago
5 0
Complete the square: 
<span>y = 3x^2 - 12x + 4 </span>
<span>y = 3(x^2 - 4x) + 4 </span>
<span>y = 3(x^2 - 4x + 4 - 4) + 4 </span>
<span>y = 3(x^2 - 4x + 4) - 12 + 4 </span>
<span>y = 3(x - 2)^2 - 8</span>
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