tolong Pakai caranya ya guys Please di jawab No 5-6

5][
(2x - 1/2)²
= 4x² - 2x + 1/4
= ax² + bx + c

a + b - c = 4 + (-2) - 1/4 = 1 3/4 ✔

6][
8x² - 14x - 15
= 8x² - 20x + 6x - 15
= 4x(2x - 5) + 3(2x - 5)
= (2x - 5)(4x + 3) ✔