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a) x₁+x₂ = -b/a = -(-4)/1 = 4
b) x₁.x₂ = c/a = 3/1 = 3
c) x₁² + x₂² = (x₁ + x₂)² - 2x₁.x₂
= (4)² - 2.3
= 16 - 6
= 10
d) 1 / x₁ + 1 / x₂ = (x₁ + x₂) / x₁.x₂
= 4/3
e) (x₁ + x₂)² = 4² = 16
f) x₁³ + x₂³ = (x₁ + x₂)³ - 3 x₁.x₂ (x₁ + x₂)
= 4³ - 3.3.4
= 64 - 36
= 28
semoga membantu ya :)
Jika yang dimaksud x1 dan x2 adalah -3 dan -1, maka seperti ini:
a. x1 + x2 = -3 - 1 = -4
b. x1 * x2 = -3 * -1 = 3
c. x1" + x2" = -3" + -1" = 9 + 1 = 10
d. 1/x1 + 1/x2 = 1/-3 + 1/-1 = -1,34
e. (x1 + x2)" = (-3 - 1)(-3 - 1) = 9 + 3 + 3 + 1 = 16
f. x1^3 + x2^3 = -3^3 + -1^3 = -27 + -1 = -28
Jika saya salah mengartikan x1 dan x2 silakan dibilang, nanti akan saya edit.