Jawab:
-1 atau -7
Penjelasan dengan langkah-langkah:
selisih kedua akar = 1
x₁-x₂ = 1
√D/a = 1
√D = a
D = a²
(-(a+1))²-4(2)(a+3) = (2)²
a²+2a+1-8a-24 = 4
a²-6a-27 = 0
(a-9)(a+3) = 0
a = -3 atau a = 9
hasil kuadrat akar2nya :
x₁²+x₂² = (x₁+x₂)²-2x₁x₂
= (a+1)/2 -2(a+3)2
= (a+1)/2-(a+3)
untuk a = -3 -> (-3+1)/2-(-3+3) = -1
untuk a = 9 -> (9+1)/2-(9+3) = -7
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Jawab:
-1 atau -7
Penjelasan dengan langkah-langkah:
selisih kedua akar = 1
x₁-x₂ = 1
√D/a = 1
√D = a
D = a²
(-(a+1))²-4(2)(a+3) = (2)²
a²+2a+1-8a-24 = 4
a²-6a-27 = 0
(a-9)(a+3) = 0
a = -3 atau a = 9
hasil kuadrat akar2nya :
x₁²+x₂² = (x₁+x₂)²-2x₁x₂
= (a+1)/2 -2(a+3)2
= (a+1)/2-(a+3)
untuk a = -3 -> (-3+1)/2-(-3+3) = -1
untuk a = 9 -> (9+1)/2-(9+3) = -7