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= x² - 5x - 50
b) (2x + 11)(x - 4)
= 2x² + 3x - 44
c) (4a - 5b)(4a + 5b)
= 16a² - 25b²
2a) (2x + 6)²
= 4x² + 24x + 36
b) (2a + 3b)²
= 4a² + 18ab + 9b²
c) (6x - 2y)²
= 36x² - 24xy + 4y²
d) (5y - 4)²
= 25y² - 40y + 16
a xkalix+xkali 10+5kalix +5kali10=x2-10x+5x-50=x2-5x-50