Question

1.if x=3√5 one root of quadrant of x²-2kx-6=0 then find the value of k solution for this question?

2.4. In an AP, the common difference and the seventh term is 4 , then find the first term.

Answer 1

2)d=4,a7=4
a+6d=4
a+6(4)=4
a+24=4
a=-20