Question

descompuneti in factori:
a) 4x la puterea 2 -20x + 25 =
b) 4x la puterea 2 -9 =

Answer 1

a) 4x^2 -20x + 25 = (2x - 5)(2x - 5) => a^2 - 2ab + b^2 = (a-b)(a-b) = (a-b)^2

b) 4x^2 -9 = (2x - 3)(2x + 3) = > a^2 - b^2 = (a-b)(a+b)