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angellong94
09.06.2020 •
Mathematics
What is the vertex of the parabola given by y = x2 − 10x + 17? A. (5, -8) B. (-5, 8) C. (5, 8) D. (-5, -8)
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Ответ:
A
Step-by-step explanation:
Given a parabola in standard form
y = ax² + bx + c ( a ≠ 0 ), then
The x- coordinate of the vertex is
y = x² - 10x + 17 ← is in standard form
with a = 1 and b = - 10, thus
Substitute x = 5 into the equation for corresponding value of y
y = 5² - 10(5) + 17 = 25 - 50 + 17 = - 8
vertex = (5, - 8 ) → A
Ответ:
-4
Step-by-step explanation:
y=x-7
plug in 3
y=3-7
y=-4