Question

Ajuta-ti-ma va rooooog!!!!!1.Daca A={ x/x apartine R , -2 mai mic sau egal x <5}
A U {5} =...
2.Descompuneti in factori
a) 4x^2 - 12x =
b) 25x^2 - 16=
c) (4x-1)^2 - 9=
ajutati-ma urgent va rog

Answer 1

1. A={-2, -1, 0, 1, 2, 3, 4}
AU{5}={-2, -1, 0, 1, 2, 3, 4, 5}

2.a) $4 x^{2} -12x$=4x(x-3)

b) $25 x^{2} -16$=$(5x)^{2} - 4^{2}$=(5x-4)(5x+4)

c) $(4x-1)^{2} - 9$=$(4x-1)^{2} - 3^{2}$=(4x-1-3)(4x-1+3)=(4x-4)(4x+2)=4(x-1)*2(2x+1)=8(x-1)(2x+1)