10.a) Folosind formula
[tex] {a}^{2} + 2ab + {b}^{2} = {(a + b)}^{2} [/tex]
scriem:
[tex]e(x) = {(2x - 3 + 2x + 3)}^{2} = {(4x)}^{2} [/tex]
b)
[tex]n = {(4x)}^{2} daca \: inlocuim \: x \: cu \: \frac{ \sqrt{2} }{2} obtinem \\ {(4 \times \frac{ \sqrt{2} }{2}) }^{2} = {(2 \sqrt{2} )}^{2} = 4 \times 2 = 8[/tex]
