Question

Va rog ex 5 va rog mult

Answer 1

Răspuns:

$(a - b)^{2} = {a}^{2} - 2ab + {b}^{2}$

$3(x - 3)(x + 2) = 3( {x}^{2} - x - 6) = \\ 3 {x}^{2} - 3x - 18$

$e(x) = 4 {x}^{2} - 4x + 1 + 3 {x}^{2} - 3x \\ - 18 + {x}^{2} - x + 1$

$(x - 2)(x + 1) = {x}^{2} - x - 2$

${(2x - 1)}^{2} = 4 {x}^{2} - 4x + 1$