Question

b) c) d)

va rog.... dau coroana!​

Answer 1

$16 {x}^{2} - 24x + 9 + 5 {x}^{2} - 15x$

$21 {x}^{2} - 39x + 9$

asta e b

$1 + 2x + {x}^{2} + 4 + 4x + {x}^{2} + 9 + 6x + {x}^{2}$

$14 + 12x + 3 {x}^{2}$

asta e c

d) x^4 +2x^2y+y^2-x^4+2x^2y-y^2=4x^2y

^= la puterea

Answer 2

Răspuns:

Explicație pas cu pas:

b) (4x-3)² + 5x(x-3) = 16x²+9-24x+5x²-15x = 21x²-39x+9

c) (1+x)²+(2+x)²+(3+x)² = 1+2x+x²+4+4x+x²+9+6x+x² =

= 3x²+12x+14

d) (x²+y)² - (x²-y)² = (x²+y+x²-y)(x²+y-x²+y) = 2x²·2y = 4x²y