Monday

December 22, 2014

December 22, 2014

Posted by **Algebra** on Thursday, April 3, 2008 at 10:45pm.

minimum or maximum

f(x)=2x^2+8x-2

a=2

x=(-b)/(2a)=(-8)/(2)(2)=-4

x=-4

y=2(-4)^2+8(-4)-2

2(16)-32-2

32-32-2

y=-2

(-4,-2)

axis of symmetry is x=-4

range[-2,oo]

minimum value -2

- John -
**bobpursley**, Thursday, April 3, 2008 at 10:49pmYou have the correct min.

- John -
**Anonymous**, Thursday, April 3, 2008 at 10:55pmIsn't this the same question as this one?

w-ww-.-jiskha.-c-om/display-.cgi?id=-1207258851

Err exactly the same. The min is wrong >.<. The minimum value occurs at x = -2 but the minimum value is not -2.

- John -
**Reiny**, Thursday, April 3, 2008 at 11:07pmYour parabola in standard form is

y = 2(x+2)^2 - 10 , (check it by expanding this)

so you have a parabola opening upwards with vertex at (-2,-10)

Minimum value is -10, when x=-2

axis of symmetry is x=-2

domain: any real number for x

range: y ≥ -10, y any real number

**Answer this Question**

**Related Questions**

Algebra - min/max point minimum or maximum f(x)=2x^2+8x-2 a=2 x=(-b)/(2a)=(-8)/(...

URGENT ALGEBRA 2 - identify the vertex and the axis of symmetry of the graph for...

Algebra 2 - 3. Identify the vertex and the axis of symmetry of the graph of the ...

algebra can someone help my buddy ray out - identify the vertex and the axis of...

ALGEBRA - Find the vertex, the line of symmetry, the maximum or minimum value of...

Math/Algebra...can you check this please... - f(x)= -4(x+5)^2+3 The vertex is...

algebra urgently need help - I have been working on these 2 problems and I think...

algebra need help soon - I have been working on these 2 problems and I think I ...

MAth - If 1 gallon (gal) of water weighs 8.34 pounds (lb), how much does 3.75 ...

Algebra - Find the vertex, the line of symmetry, the maximum or minimum of the ...