when \(a<0\)
when \(a<0\)
Secondary 3
Express \(y=-5{{x}^{2}}+5x-6\) in the form of \(y=-5{{(x-h)}^{2}}+k\).
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Answer:\(y=-5\left(x-\frac12\right)^2-\frac{19}{4}\), where \(h=\frac12\) and \(k=-\frac{19}{4}\)
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