Mw3spartan17
29.01.2021 •
Mathematics
The distance between town A and town B on a map is 15.6cm. If the scale is 1cm=12 miles, what is the actual distance between towns
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Ответ:
Given function:
f(x) = 4x² + 8x - 5 Part AThe x-intercept is the point(s) with y = 0
4x² + 8x - 5 = 04x² + 8x + 4 = 9(2x + 2)² = 92x = -2 ± 3x₁ = -2.5x₂ = 0.5Part BThe leading coefficient is positive. It mean the graph opens up. It in turn means the vertex is the lowest point.
The vertex is defined by:
x = -b/2a, which is x = -8/(2*4) = -1f(-1) = 4(-1)² + 8(-1) - 5 = -9Part CPlot the vertex (-1, -9), x-intercepts (0.5, 0) and (-2.5, 0) and connect the points considering the graph opens up. You may need to add more points to the graph if need more accurate graph.