Jawaban:
Penjelasan dengan langkah-langkah:
y = a(x-x₁)(x-x₂)
-24=a(0-(-3)(x-8)
-24=a(0+3)(0-8)
-24=a(3)(-8)
-24=a(-24)
a=-24/-24
a=1
y=a(x+3)(x-8)
y=1(x²+3x-8x-24)
y=x²-5x-24
a. Persamaan sumbu simetri
b. Nilai minimum
(x₁+x₂)/2=(-3+8)/2=(5/2)=2 1/2
atau
x=-b/2a = -(-5)/2(1)=5/2=2 1/2
f(2 1/2)=(2 1/2)²-5(2 1/2)-24
=6,25-12,5-24
=-6,25-24
=-30,25
Y = -D/4a
= -(b²-4ac)/4a
=-(-5²-4.1.-24)/4.1
=-(25+96)/4
=-(121)/4
=-30 1/4
c. Koordinat titik minimum
(2 1/2, -30 1/4)
Demikian
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Jawaban:
Persamaan Kuadrat
Penjelasan dengan langkah-langkah:
y = a(x-x₁)(x-x₂)
-24=a(0-(-3)(x-8)
-24=a(0+3)(0-8)
-24=a(3)(-8)
-24=a(-24)
a=-24/-24
a=1
y=a(x+3)(x-8)
y=1(x²+3x-8x-24)
y=x²-5x-24
a. Persamaan sumbu simetri
y=x²-5x-24
b. Nilai minimum
(x₁+x₂)/2=(-3+8)/2=(5/2)=2 1/2
atau
x=-b/2a = -(-5)/2(1)=5/2=2 1/2
f(2 1/2)=(2 1/2)²-5(2 1/2)-24
=6,25-12,5-24
=-6,25-24
=-30,25
atau
Y = -D/4a
= -(b²-4ac)/4a
=-(-5²-4.1.-24)/4.1
=-(25+96)/4
=-(121)/4
=-30 1/4
c. Koordinat titik minimum
(2 1/2, -30 1/4)
Demikian