$\text{Giải thích các bước giải:}$
$(2x + 5)(2x - 7) - (-4x - 3)² = 16$
$⇒ 4x² - 14x + 10x - 35 - 16x² - 24x + 9 = 16$
$⇒ (4x² - 16x²) - (14x - 10x + 24x) = 16 - 9 + 35$
$⇒ -12x² - 28x = 35$
$⇒ -3(4x² + \dfrac{28}{3}x + \dfrac{49}{9}) - \dfrac{49}{3} = \dfrac{56}{3}$
$⇒ -3(2x + \dfrac{7}{3})² = \dfrac{56}{3}$
$⇒ (2x + \dfrac{7}{3})² = -\dfrac{56}{9}$
$⇒ x ∈ ∅$
$\huge\text{Hok tốt !}$
