Question

Ex 7. VA ROG URGENT!

Answer 1

Răspuns:

ex &

a. (x-5) (x+1)

b. (x+3)(x-7)

e. (x-1)(x+2)

f.(x-2)(x+3)

i. (x-2)(x+1)

j. ( x-2)(x+6)

Explicație pas cu pas:

a.

x la 2 - 4 x - 5 = x la  2 -5x+x - 5= x(x+1) - 5 ( x+1)= (x+1) (x-5)

b.

x la 2 -4 x - 21 = x la 2 - 7x+3 x - 21 = x ( x+3) - 7 ( x+3) = (x+3)(x-7)

e.

xla2 +x-2 = xla2+2x-x-2= x(x-1) +2(x-1)= (x-1)(x+2)

f.

xla2+x-6= xla2+3x-2x-6= x (x+3) - 2 ( x+3) = (x+3)(x-2)

i.

xla2-x-2= xla2-2x+x-2= x(x+1) - 2(x+1) = ( x+1)(x-2)

j.

xla2+4x-12= xla2+6x-2x-12= xla2-2x+6x-12= x(x-2)+6(x-2)= (x-2)(x+6)