Which are the solutions of x2 = –7x – 8?

The solutions are:

Step-by-step explanation:

We have the following quadratic equation

We can rewrite the equation as follows

Now we use the quadratic formula to solve the equation

For an equation of the form the quadratic formula is:

In this case:

Then:

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500