How do I simplify 7+4(2-6)

It is given that the quadratic equation hx²-3x+k=0, where h and k are constants, has roots [tex] \beta \: and \: 2 \beta [/tex]express h in terms of k

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?

Is there an x intercept in the equation 60*1.15^x