(x² - 7x)×3 = 4
3x² - 21x = 4
3x² - 21x - 4 = 0
D = (-21)² -4 × 3 ×(-4)
D = √489
x(1,2) = 21±√489 /6
x(1) = 21+√489 /6
x(2) = 21-√489 /6
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Answers & Comments
(x² - 7x)×3 = 4
3x² - 21x = 4
3x² - 21x - 4 = 0
D = (-21)² -4 × 3 ×(-4)
D = √489
x(1,2) = 21±√489 /6
x(1) = 21+√489 /6
x(2) = 21-√489 /6