ajutați-mă va rog dau coroană
Răspunsuri la întrebare
a) 2x(x+1) - 5(x+1) Se repeta x+1 deci pe el il dai ca factor comun
(x+1)(2x×1 -5×1) = (x+1)(2x-5)
b) (2x+3)(4-x+x+1) = (2x+3)×5
c) (3x-7)(6x+5)
d) (2x-1)(14x-7) in 14x-7 factor comun e 7
7(2x-1)(2x-1) = 7(2x-1)²
e) (x+6)[10x + 5(x+6)] = (x+6)(10x+5x+30) = (x+6)(15x+30) = 15(x+6)(x+6) = 15(x+6)²
f) 6(x-3)[2(x-3) +x] = 6(x-3)(2x-6+x) = 6(x-3)(3x-6) = 3×6(x-3)(x-2) = 18(x-3)(x-2)
g) 7(3x-1)[3x - (3x-1)] = 7(3x-1)(3x-3x+1) = 7(3x-1)
h) 8(4x+3)[3x -(4x+3)] = 8(4x+3)(3x-4x-3) = 8(4x+3)(-x-3)
i) (2x+5)(3x-6-2x+8+2) = (2x+5)(x+4)
Răspuns: