将y=3x^2-12x+9化为y=a(x-h)^2+k

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将y=3x^2-12x+9化为y=a(x-h)^2+k将y=3x^2-12x+9化为y=a(x-h)^2+k将y=3x^2-12x+9化为y=a(x-h)^2+ky=3x^2-12x+9=3(x

将y=3x^2-12x+9化为y=a(x-h)^2+k
将y=3x^2-12x+9化为y=a(x-h)^2+k

将y=3x^2-12x+9化为y=a(x-h)^2+k
y=3x^2-12x+9
=3(x²-4x)+9
=3(x²-4x+4)+9-3×4
=3(x-2)²-3

y=3(x^2-4x+4)-3
y=3(x-2)^2-3