genyjoannerubiera
15.04.2020 •
Mathematics
Solve the equation. 2x2 + 24x + 72 = 0 options: {−6} {−6,0} {−9,−6, 0} {−9,−4}
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Ответ:
x = - 2
Step-by-step explanation:
(f + g)(x) = f(x) + g(x)
f(x) + g(x) = x² - 2x + 6x + 4 = x² + 4x + 4
Equating to zero, that is
x² + 4x + 4 = 0 ← left side is a perfect square
(x + 2)² = 0, thus
x + 2 = 0 ⇒ x = - 2