Jawab:
Suku Banyak
akar akar suku banyak
Penjelasan dengan langkah-langkah:
4. x³ + 9x² - 22x + k= 0 dan x1 = 5
x1 + x2 + x3 = - b/a
5 + (x2 + x3) = - (9)/1
x2 + x3 = -9 - 5
x2 + x3 = -14
Jumlah kedua akar lainnya = x2 + x3 = - 14
5. y = 2x³ - 7x² - 24x + 45 memotong sumbu x , jika y = 0
maka 2x³ - 7x² - 24x + 45= 0
(x + 3) (x - 5)(2x - 3) = 0
x = - 3 , x = 5 , x = 3/2 dengan x1 > x2 > x3
maka x1 = 5, x2 = 3/2 dan x3 = - 3
x1² + x3² = (5)² + (- 3)² = 34
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Verified answer
Jawab:
Suku Banyak
akar akar suku banyak
Penjelasan dengan langkah-langkah:
4. x³ + 9x² - 22x + k= 0 dan x1 = 5
x1 + x2 + x3 = - b/a
5 + (x2 + x3) = - (9)/1
x2 + x3 = -9 - 5
x2 + x3 = -14
Jumlah kedua akar lainnya = x2 + x3 = - 14
5. y = 2x³ - 7x² - 24x + 45 memotong sumbu x , jika y = 0
maka 2x³ - 7x² - 24x + 45= 0
(x + 3) (x - 5)(2x - 3) = 0
x = - 3 , x = 5 , x = 3/2 dengan x1 > x2 > x3
maka x1 = 5, x2 = 3/2 dan x3 = - 3
x1² + x3² = (5)² + (- 3)² = 34