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(3x +1)(x-4) = 0
x = -1/3 atau x = 4
.
2) 4x² - 7x + 3 = 0
x1+x2 = 7/4
x1.x2= 3/4
.
a) (x1+x2)^2 = (7/4)³ = 49/16
b) x1² - x2² = (x1+x2)² - 2 x1.x2 = 49/16 - 2(3/4) = 25/16
c) (x1².x2)(x1. x2²) = (x1.x2)³ = (3/4)³ = 27/64