1) (y-4)² = y² - 8y + 162) (7x+a)² = 49x² + 14ax + a²3) (5c-1)(5c+1) = 25c² - 14) (3a+2b)(3a-2b) = 9a² - 4b²
(a-9)² - (81+2a) = a² - 18a + 81 - 81 - 2a = a² - 20a
(2-x)² - x(x+1.5) = 4(2-x)(2-x) - x² - 1.5x = 44 - 4x + x² - x² - 1.5x = 0-5.5x = 0x = 0
1) x² - 49 = (x + 7)(x - 7)2) 25x² - 10xy + y² = (5x - y)(5x - y)
1) (y-4)² = y² - 8y + 16
2) (7x+a)² = 49x² + 14ax + a²
3) (5c-1)(5c+1) = 25c² - 1
4) (3a+2b)(3a-2b) = 9a² - 4b²
(a-9)² - (81+2a) = a² - 18a + 81 - 81 - 2a = a² - 20a
(2-x)² - x(x+1.5) = 4
(2-x)(2-x) - x² - 1.5x = 4
4 - 4x + x² - x² - 1.5x = 0
-5.5x = 0
x = 0
1) x² - 49 = (x + 7)(x - 7)
2) 25x² - 10xy + y² = (5x - y)(5x - y)