fACTORISE XTOTHE POWER3 +21XTO THE POWER2+147X+343 Share with your friends Share 1 Rishabh Mittal answered this Let px=x3+21x2+147x+343Factors of 343 are ±7.p-7=-73+21-72+147-7+343 =-343+1029-1029+343=0so, x+7 is a factor of x3+21x2+147x+343now,x3+7x2+14x2+98x+49x+343x2x+7+14xx+7+49x+7x+7x2+14x+49x+7x2+2x7+72x+7x+72so, factors are x+7x+7x+7Or , you can also do this like thatwe know,a+b3=a3+3a2b+3ab2+b3px=x3+21x2+147x+343 =x3+3x27+3x72+73 =x+73=x+7x+7x+7. so, factors are x+7x+7x+7 0 View Full Answer Abhishek answered this FACTORISE x3 + 21X2 + 147X + 343 0
