sb help with a math problem!
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sb help with a math problem!
2x(square)-8x+7=y to calculate the minimum and maxmum value.how?i can't graph it out.
2x(square)-8x+7=y to calculate the minimum and maxmum value.how?i can't graph it out.
![sb help with a math problem!](/uploads/image/z/17264746-10-6.jpg?t=sb+help+with+a+math+problem%21)
∵y=2x^2-8x+7=2(x-2)^2-1
(x-2)^2≥0,
∴2(x-2)^2-1≥-1.
So,y(min)=-1
(x-2)^2≥0,
∴2(x-2)^2-1≥-1.
So,y(min)=-1
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