(3x - 5)² - (x + 3)² = (3x - 5 - x - 3)(3x - 5 + x + 3) = (2x - 8)(4x - 2)
a^6 - (a + 4)² = (a³ - a - 4)(a³ + a + 4)
(a + b - c)² - (a - b + c)² = (a + b - c - a + b - c)(a + b - c + a - b + c) = 2a(2b - 2c) = 4a(b - c)
1) 9х -11>5(2х-3)
I hope this helps you
y > x²-2
x²+y+4 ≥ 0 ⇒ y ≥ -x²-4