Question

Am nevoie de ajutor in intelegerea acestor 2 exercitii ,multumesc.

Answer 1

Răspuns:

$f(a) = 2 {a}^{2} + 5a + 2$

$2 {a}^{2} + 5a + 2 = 0$

a=2

b= 5

c= 2

$d = {b}^{2} - 4 \times a \times c$

$d = 25 - 4 \times 2 \times 2$

$d = 25 - 16 = > d =9$

$a1 = \frac{ - b - \sqrt{d} }{2 \times a} => a1 = \frac{ - 5 - \sqrt{9} }{2 \times 2} =>a1 = \frac{ - 5 - 3}{4} =>a1 = \frac{ - 8}{4} => a1 = - 2$

$a2 = \frac{ - b + \sqrt{d} }{2a} => a2 = \frac{ - 5 + \sqrt{9} }{2 \times 2} => a2 = \frac{ - 5 + 3}{4} =>a2 = \frac{ - 2}{4}$