Срочно срочно срочно срочно срочно срочно

(2x - 7)(x + 1) + 3(4x - 1)(4x + 1) = 2(5x - 2)² - 53
2x² + 2x - 7x - 7 + 48x² - 3 = 50x² - 40x + 8 - 53
50x² - 5x - 10 - 50x² + 40x + 45 = 0
35x = - 35
x = - 1

(3a + 1)² - (a + 6)² = ( 3a + 1 + a + 6)(3a + 1 - a - 6) = (4a + 7)(2a - 5)

(2 - x)(2 + x)(4 + x²) + (6 - x²)² = (4 - x²)(4 + x²) + (6 - x²)² =
= 16 - x⁴ + 36 - 12x² + x⁴ = 52 - 12x²
Если $x = - \frac{1}{2} ,$ то
$52 - 12*(- \frac{1}{2}) ^{2} =52-12* \frac{1}{4}=52-3=49$