Question

calculati: (7x+3)²= ; (8x-3) (8x+3)= ; (x²+2x-5)²= ; (x²+x+1)²= ;(11x-7)²= ; (12x+8)²= ;va rog mult ajutati-ma si pe mine.

Answer 1

Răspuns:

(7x+3)^2 = 49x^2 + 42x + 9

(8x-3)(8x+3) = 64x^2 - 9

(x^2 + 2x - 5)(x^2 + 2x - 5) = x^4 + 2x^3 -5x^2 + 2x^3 + 4x^2 - 10x - 5x^2 - 10x + 25

= x^4 + 4x^3 - 6x^2 - 20x + 25

(x^2 + x + 1)(x^2 + x + 1) = x^4 + x^3 + x^2 + x^3 + x^2 + x + x^2 + x + 1 =

x^4 + 2x^3 + 3x^2 + 2x + 1

(11x-7)^2 = 121x^2 - 154x + 49

(12x+8) = 144x^2 + 192x + 64