Question

ПОМОГИТЕ ПОЖАЛУЙСТА СРОЧО!!​

Answer 1

Răspuns:

Explicație pas cu pas:

1) a) x²-6x+9 = (x-3)²

b) 4x+24x² = 4x·(1+6x)

c) 16x² - 9 = (4x+3)(4x-3)

2) x³-3x+xy²-2x²y-3x³ = x³-3x³ -3x+xy²-2x²y =

= -2x³-3x+xy²-2x²y

x³ si -3x³

3) 5x- 5y = 5·(x-y)

   15x²+5x = 5x·(3x+1)

   x²+10x+25 = (x+5)²

25x²-4 = (5x-2)(5x+2)

4) E(x) = 2x²-x³ ; x = -2 =>

E(-2) = 2·(-2)²-(-2)³ = 2·4-(-8) = 8+8 = 16

E(-2) = 16