Step-by-step explanation:
the answer is in the image above
To solve the quadratic equation given by 0=x^2-9x-20, we use the quadratic formula given by:
x=[-b+\- sqrt(b^2-4ac)]/(2a)
where,
a=1,b=-9,c=-20
thus substituting the above values into our formula we get:
x=[9+\-sqrt(9^2-4(-20*1))/(2*1)
x=[9+\-sqrt(161)]/2
x=[9+sqrt161]/2 or x=[9-sqrt161]/2
I believe you want us to simplify the expression.
Note that 5 + (-6) is the same as 5 - 6
Simplify
4 + 5 = 9
9 + (-6) = 9 - 6 = 3
3 is your answer
hope this helps
300-3x=33
Subtract 300 on both sides.
-3x=-273
Divide both sides by -3.
x=91
I hope this helps!
~kaikers