Question

1) Dado a função quadrática y
= x2- 2x - 3, o zero da função
é: *
a) 3 e -1;
b) 2 e 1;
c) 3 e -2;
d) 3 e 1.​

Answer 1

Resposta:

ITEM (A)

Explicação passo-a-passo:

${ \color{violet}{\bf{\Large{y = {x}^{2} - 2x - 3 }}}}$

${ \color{violet}{\bf{\Large{0 = {x}^{2} - 2x - 3}}}}$

${ \color{violet}{\bf{\Large{ {x}^{2} - 2x - 3 = 0 }}}}$

${ \color{violet}{\bf{\Large{ {x}^{2} + x - 3x - 3 = 0}}}}$

${ \color{violet}{\bf{\Large{x(x + 1) - 3(x + 1) = 0}}}}$

${ \color{violet}{\bf{\Large{(x + 1)(x - 3) = 0}}}}$

${ \color{violet}{\bf{\Large{x + 1 = 0}}}} \\ { \color{violet}{\bf{\Large{x - 3 = 0}}}}$

${ \color{violet}{\bf{\Large{x = - 1}}}} \\ { \color{violet}{\bf{\Large{x = 3}}}}$

${ \color{violet}{\bf{\Large{\boxed{ x_{1} = - 1 }}}}} \\ { \color{violet}{\bf{\Large{\boxed{ x_{2} = 3}}}}}$

$\color{plum}\text{{ \boxed{{\mathbb{ATT: ARMANDO}}}}}$