Question

ajutati maaaaa ex 36 si 37​

Answer 1

Răspuns:

buna, sper că te am ajutat!!

Answer 2

Explicație pas cu pas:

36.b)

E(x) = (3-x)(x+3) = 9-x²

$a = E(2 \sqrt{3} ) + E( - 2 \sqrt{3} ) + 2 = 9 - {(2 \sqrt{3} )}^{2} + 9 - {( - 2 \sqrt{3} )}^{2} + 2 = 9 - 12 + 9 - 12 + 2 = - 4$

$- \sqrt{17} < - \sqrt{16} = 4$

$- 4 = - \sqrt{16} < - \sqrt{12} = - 2 \sqrt{3}$

$\implies - \sqrt{17} < - 4 < - 2 \sqrt{3}$

$\implies \bf a \in \Big[- \sqrt{17} ; - 2 \sqrt{3} \Big]$

q.e.d.