-21x^(2)-2x+(1)/(21)

Find the roots of the following quadratic equations by the factorization method: 21 x^(2) -2x+(1)/(21)=0

Factorize: 21 x^2-2x+1/(21)

21x^2+5x-6

21x^(2) - 28x + 10=0

21x^(2) - 28x + 10=0

21x^(2) - 28x + 10=0

21x^(2) - 28x + 10=0

21x^(2) - 28x + 10=0

Find the integral int(1)/(5-8x-x^(2))dx A. (1)/(2sqrt(21))log|(sqrt(21)+(x+4))/(sqrt(21)-(x+4))|+C .B. (1)/(2sqrt(21))log|(sqrt(21)-(x+4))/(sqrt(21)+(x+4))|+C C. (1)/(sqrt(21))log|((x+4)+sqrt(21))/((x+4)-sqrt(21))|+Cquad D. (1)/(sqrt(21))log|((x+4)-sqrt(21))/((x+4)+sqrt(21))|+C

If the roots of x^(4) - 2x^(3) - 21x^(2) + 22x + 40 = 0 are in A.P. then the roots are