Which of the following are solutions to the equation below?
check all that apply.
x2 + 3x - 18 = 0
a. 9
b. 3
c. -3
d. 6
e. 18
f. -6

Step-by-step explanation:

To find the solution of this quadratic equation, we could apply several simple steps.

First, we write to factor, which one is gonna have a variable followed by a sign. The first factor is gonna have the same sign as the second term of the quadratic expression, which is positive. The second factor is gonna have a negative sign, which is given by multiplying the sign of the second term and the third term. So, the factors are gonna stay like this:

Now, we have to find two numbers (a and b), which product result 18, and subtract result in 3. Those numbers are 6 and 3, because 6(3) = 18, and 6-3=3. The numbers need to be subtracted, because the factor have different signs.

Therefore, the solution factors are:

At last, we say that each factor is equal to zero to find the exact solutions:

the anwser is d) 75°

step-by-step explanation: