The standard form of a parabola is y=ax²+bx+c use the three given points to find the three unknown constants a, b, and c: -2=a+b+c1 -2=4a+2b+c 2 -4=9a+3b+c3 equation 2 minus equation 1: 3a+b=04 equation 3 minus equation 2: 5a+b=-25 equation 5 minus equation 4: 2a=-2, so a=-1 plug a=-1 in equation 4: -3+b=0, so b=3 Plug a=-1, b=3 in equation 1: -2=-1+3+c, so c=-4 the parabola is y=-x²+3x-4
double check: when x=1, y=-1+3-4=-2 when x=2, y=-4+6-4=-2 when x=3, y=-9+9-4=-4 Yes.
One form of the equation of a parabola is y = ax² + bx + c
The curve passes through (0,-6), (-1,-12) and (3,0). Therefore c = - 6 (1) a - b + c = -12 (2) 9a + 3b + c = 0 (3)
Substitute (1) into (2) and into (3). a - b -6 = -12 a - b = -6 (4) 9a + 3b - 6 = 0 9a + 3b = 6 (5)
Substitute a = b - 6 from (4) into (5). 9(b - 6) + 3b = 6 12b - 54 = 6 12b = 60 b = 5 a = b - 6 = -1
The equation is y = -x² + 5x - 6
Let us use completing the square to write the equation in standard form for a parabola. y = -[x² - 5x] - 6 = -[ (x - 2.5)² - 2.5²] - 6 = -(x - 2.5)² + 6.25 - 6
y = -(x - 2.5)² + 0.25 This is the standdard form of the equation for the parabola. The vertex us at (2.5, 0.25). The axis of symmetry is x = 2.5 Because the leading coefficient is -1 (negative), the curve opens downward. The graph is shown below.
y = -(x - 2.5)² + 0.25 [tex]Find an equation in standard form of the parabola passing through these points: (0,-,-,0)[/tex]
The standard form of a parabola is y=ax²+bx+c
use the three given points to find the three unknown constants a, b, and c:
-2=a+b+c1
-2=4a+2b+c 2
-4=9a+3b+c3
equation 2 minus equation 1: 3a+b=04
equation 3 minus equation 2: 5a+b=-25
equation 5 minus equation 4: 2a=-2, so a=-1
plug a=-1 in equation 4: -3+b=0, so b=3
Plug a=-1, b=3 in equation 1: -2=-1+3+c, so c=-4
the parabola is y=-x²+3x-4
double check: when x=1, y=-1+3-4=-2
when x=2, y=-4+6-4=-2
when x=3, y=-9+9-4=-4
Yes.
One form of the equation of a parabola is
y = ax² + bx + c
The curve passes through (0,-6), (-1,-12) and (3,0). Therefore
c = - 6 (1)
a - b + c = -12 (2)
9a + 3b + c = 0 (3)
Substitute (1) into (2) and into (3).
a - b -6 = -12
a - b = -6 (4)
9a + 3b - 6 = 0
9a + 3b = 6 (5)
Substitute a = b - 6 from (4) into (5).
9(b - 6) + 3b = 6
12b - 54 = 6
12b = 60
b = 5
a = b - 6 = -1
The equation is
y = -x² + 5x - 6
Let us use completing the square to write the equation in standard form for a parabola.
y = -[x² - 5x] - 6
= -[ (x - 2.5)² - 2.5²] - 6
= -(x - 2.5)² + 6.25 - 6
y = -(x - 2.5)² + 0.25
This is the standdard form of the equation for the parabola.
The vertex us at (2.5, 0.25).
The axis of symmetry is x = 2.5
Because the leading coefficient is -1 (negative), the curve opens downward.
The graph is shown below.
y = -(x - 2.5)² + 0.25
[tex]Find an equation in standard form of the parabola passing through these points: (0,-,-,0)[/tex]
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