Question

3) Fatore as diferenças de quadrados:
a) x2 - 144 =
b) 49 - x2 =
c) 9x2 - 36 =
d) 4x2 - 81 =
e) 16x2 - 25y2 =​

Answer 1

a) x2 - 144 = (x+12).(x-12)

b) 49 - x2 = (7+x).(7-x)

c) 9x2 - 36. = (3x+6).(3x-6)

d) 4x2 - 81 = (2x+9).(2x-9)

e) 16x2 - 25y2 =(4x+5y).(4x-5y)