Question

kindly help me....i would be very thankfull to you...

Answer 1

1)25a²-4b²+28bc-49c²
=25a² -[(2b)²- 2*2b*7c+(7c)²]
=(5a)²- [2b-7c]²
=(5a+2b-7c)[5a-(2b-7c)]
=(5a+2b-7c)(5a-2b+7c)
2)p²+6p+8
=p²+2p+4p+4*2
=p(p+2) +4(p+2)
=(p+2)(p+4)