Question

calculati
a)2•(3x-4)
b)E=(2x-3) la patrat+(x-3)(x+3)
c)999875 la patrat-125 la patrat!
URGENTTTTTT!​

Answer 1

Răspuns:

Explicație pas cu pas:

a) 6x-8

b)(2x-3)²+(x²-9)=4x²-12x+9+x²-9=5x²-12x=x(5x-12)

c) 999875²-125²=(999875+125)(999875-125)=1000000×999750=

=999 750 000 000

Answer 2

a) 2*(3x-4) = 2*3x - 2*4 = 6x - 8

b) E = (2x-3)^2 + (x-3)(x+3) = (2x)^2 - 2*2x*3 + 3^2 + x^2 - 9 = 4x^2 - 12x + 9 +x^2 - 9 = 5x^2 - 12x = x(5x - 12)

c) 999875^2 - 125^2 = (999875 + 125)(999875 - 125) = 1000000 * 999750 = 999750000000