Se consideră expresia E(x) = $$(2x+1)^2 + (2x-1)^2 - 4(2x^2+3x)$$ . Atunci:

E(x) = $$4x^2 - 8x + 3$$ pentru orice x ∈ ℝ.

E(x) = $$8x^2 + 2x - 1$$ pentru orice x ∈ ℝ.

E(x) = $$2x^2 - 12x + 5$$ pentru orice x ∈ ℝ.

Se consideră expresia E(x) = $$(5x+3)^2 - (3x+4)^2$$ , unde x este număr real. Atunci:

E(x) = (2x-1)(8x+7) pentru orice x ∈ ℝ.

E(x) = (8x-1)(2x+7) pentru orice x ∈ ℝ.

E(x) = (2x+1)(8x-7) pentru orice x ∈ ℝ.

E(x) = (5x+3)(3x+4) pentru orice x ∈ ℝ.

Se consideră expresia E(x) = $$3(x-2)·(x+2)$$ - $$(x-3)^2$$ - $$9(x-1)$$ + 3. Atunci:

E(x) = (x-3)(2x+3) pentru orice x ∈ ℝ.

E(x) = (x+3)(2x-3) pentru orice x ∈ ℝ.

E(x) = (x-2)(2x+3) pentru orice x ∈ ℝ.

E(x) = (x-3)(2x-3) pentru orice x ∈ ℝ.

Se dă expresia $$E(x) = (2x + 3)^2 – (2x – 1)^2 – 15(x + 1) + 7$$ , x ∈ R. Atunci:

E(x) = 2x pentru orice x ∈ R.

E(x) = x + 1 pentru orice x ∈ R.

E(x) = 3x pentru orice x ∈ R.

Care dintre următoarele afirmații este adevărată despre E(n)?

E(n) este un număr irațional.

Se consideră expresia E(x)= $$x(2x−5)+(x+5)^2−(x+2)^2−(3+x)(x−3)−30$$ , unde x este număr real. Atunci:

E(x)= $$x^2+x$$ pentru orice x∈R.

E(x)= $$2x^2−x$$ pentru orice x∈R.

E(x)= $$x^2−x$$ pentru orice x∈R.

E(x)= $$2x^2+x$$ pentru orice x∈R.

SUB. III.2-CLS 8

Authored by SANDA BARBU

Mathematics

8th Grade

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72 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

E(x) = 6 - 2x pentru orice x ∈ ℝ.

E(x) = 2x + 6 pentru orice x ∈ ℝ.

E(x) = 6x - 2 pentru orice x ∈ ℝ.

E(x) = 2 - 6x pentru orice x ∈ ℝ.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

(0, 1)

[1, 2]

(2, +∞)

(-∞, 2)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

E(-3) este pătratul unui număr natural.

E(-3) nu este pătratul unui număr natural.

E(-3) este un număr prim.

E(-3) este un număr impar.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

n = 9

n = 0

n = 12

n = 8

DROPDOWN QUESTION

1 min • 1 pt

E(x) = 2 - 12x pentru orice x ∈ ℝ.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

3 sau 0

4 sau 3

0 sau 1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

2x²

x² + 4

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