Question

1) Fatore as expressões:

a) a² –25 =

b) x² –1 =

c) a² –4 =

d) 9 –x² =

e) z² –s² =

f) 4x² –25 =

g) 9x² –1 =

h) 4a² –36 =

Answer 1

a) a² –25 = (a+5).(a-5)

b) x² –1 = (x+1).(x-1)

c) a² –4 = (a+2).(a-2)

d) 9 –x² = (3+x).(3-x)

e) z² –s² = (z+s).(z-s)

f) 4x² –25 = (2x+5).(2x-5)

g) 9x² –1 = (3x+1).(3x-1)

h) 4a² –36 = (2a+6).(2a-6)