5a³-20ab² = 5a(a² - 4b²) = 5a(a+2b)(a-2b)
(5³25²)/(5²5⁵) = (125625)/(253125) = 78125/78125 = 1
9(x + 1) – 2(2 – 3x) = – 109x + 9 - 4 + 6x = -1015x + 5 = - 1015x = -15x = -1
(2x+1)²-(2x-2)(2x+2) = 17(4x² + 4x + 1) - (4x² - 4) = 174x + 5 = 174x = 12x = 3
5a³-20ab² = 5a(a² - 4b²) = 5a(a+2b)(a-2b)
(5³25²)/(5²5⁵) = (125625)/(253125) = 78125/78125 = 1
9(x + 1) – 2(2 – 3x) = – 10
9x + 9 - 4 + 6x = -10
15x + 5 = - 10
15x = -15
x = -1
(2x+1)²-(2x-2)(2x+2) = 17
(4x² + 4x + 1) - (4x² - 4) = 17
4x + 5 = 17
4x = 12
x = 3