Question

Find the roots of quadratic equation: sqrt 3x^ 2 +11x+6 sqrt 3=0 t using quadratic formula. 8. If a n =3+4n, then show that a 1 ,a 2 ,a 3 ,...,a n form an AP and also find the sum of first 15 terms of an AP​

Answer 1

3 x 2 +11x+6 3=0

a= 3 ,b=11,c=6 3x= 2a−b± b 2 −4acx= 2 3−11± 11 2 −4 3 6 3= 2 3−11±49= 2 3 −11±7∴x=− 32 3 ,−3