Question

Solve the equation by graphing
x^2 + 7x + 19 = 0
Choices:)
A.) x = 49
B.) no solution
C.) x = 19
D.) x = 12

Let f(x) = x^2 + 6 and g(x) = x+8/x. Find (g times f)(-7)

Choices :)
A.) -55/7
B.) 384/7
C.) 295/49
D.) 63/55

Answer 1

do you know the quadratic formula?

Answer 2

For witch one ?

Answer 3

What I have in the question's is all that I have to figure out the answer's.

Answer 4

for the first one, you can use the quadratic formula, which looks like this:
\[x=\frac{ -b \pm \sqrt{b^{2}-4ac} }{ 2a }\]
where your original equation is in the form ax^2+bx+c
try this, and see what you get

Answer 5

Ok, thanks

Answer 6

for the second one, multiply g and f together. whatever you get, plug in -7 for x, and simplify it
try this and see what you get

Answer 7

for number one.
just check the value of D (discriminant), with D=b^2-4ac
if D < 0, it means gives no solution...