5a³-20ab² = 5a(a² - 4b²) = 5a(a+2b)(a-2b)
(5³25²)/(5²5⁵) = (125625)/(253125) = 78125/78125 = 1
9(x + 1) – 2(2 – 3x) = – 19x + 9 - 4 + 6x = -115x + 5 = - 115x = -1x = -1
(2x+1)²-(2x-2)(2x+2) = 1(4x² + 4x + 1) - (4x² - 4) = 14x + 5 = 14x = 1x = 3
5a³-20ab² = 5a(a² - 4b²) = 5a(a+2b)(a-2b)
(5³25²)/(5²5⁵) = (125625)/(253125) = 78125/78125 = 1
9(x + 1) – 2(2 – 3x) = – 1
9x + 9 - 4 + 6x = -1
15x + 5 = - 1
15x = -1
x = -1
(2x+1)²-(2x-2)(2x+2) = 1
(4x² + 4x + 1) - (4x² - 4) = 1
4x + 5 = 1
4x = 1
x = 3