sipho's dad used 4/11 of the packet of oranges to make juice.The next day he used another 4/11 of the packet of oranges.How many
1 answer:
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Answer:
graph several points and draw a curve through them
Step-by-step explanation:
First of all, I would remove the common factor of 2 from the coefficients. This makes it easier to see how the equation might be factored.
y = 2(x^2 +8x +15)
The constant 15 has factors 1, 3, 5, 15. The two that add up to 8 are 3 and 5, so this can be further factored as ...
y = 2(x +3)(x +5)
This tells you the x-intercepts (where y=0) are x=-3 and x=-5.
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The line of symmetry is halfway between, at x = -4. The vertex value is the value of y at that point:
y = 2(-4+3)(-4+5) = 2(-1)(1) = -2
So, the minimum is (-4, -2). The graph crosses the x-axs at x=-5 and -3. The overall factor of 2 tells you this is expanded vertically by a factor of 2, so the curve goes up by double the square of the distance from the axis of symmetry: points (-2, 6), (-1, 16), and their reflections across the line of symmetry, (-6, 6), (-7, 16) are all on the curve.
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So, the graph will start with the points you know:
(-4, -2), (-5, 0), (-3, 0), (-6, 6), (-2, 6), (-7, 16), (-1, 16)
Then you draw a smooth curve through them.
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Personally, I like to use a graphing calculator to draw the graph.
