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Tanya [424]
3 years ago
13

Help with Algebra! Completing the square!

Mathematics
2 answers:
Juli2301 [7.4K]3 years ago
7 0
B. First off , standard form of a 2nd degree equation is Ax^2 + Bx + C. So look at the coefficient of Ax^2 which is -2.
If positive, the parabola opens up and has a minimum.
If negative, the parabola opens down and has a maximum.

A. To find the vertex (in this case maximum),
Graph the equation -OR—
make a table. — OR—
Find the zeroes and find the middle x-value
-2x^2 - 4x + 6
-2(x^2 +2x - 3 = 0
-2 (x - 1) ( x + 3)=0
x - 1 = 0. x + 3 = 0
x = 1. x = -3. So halfway would be at (-1, __).
Sub in -1 into original equation -2x^2 -4x + 6 … -2(-1)^2 -4(-1) + 6 = -2 +4 +6 = 8
So the vertex is (-1,8)


natulia [17]3 years ago
6 0

Answer:

Part a:f(x)=-2(x+1)^2+8

Part b: Maximum value

Step-by-step explanation:

Part a.

The given function is f(x)=-2x^2-4x+6.

We need to complete the square to obtain the vertex form

f(x)=-2(x^2+2x)+6

Add and subtract the square of half the coefficient of x.

f(x)=-2(x^2+2x+(1)^2)--2(1)^2+6

f(x)=-2(x^2+2x+1)+2+6

The quadratic trinomial within the parenthesis is now a perfect square

f(x)=-2(x+1)^2+8

The vertex form is f(x)=-2(x+1)^2+8

Part b

Comparing f(x)=-2(x+1)^2+8 to f(x)=a(x-h)^2+k, we have a=-2.

Since a is negative the vertex is a maximum point.

Hence the function has a maximum value

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