Answer:
-77
Step-by-step explanation:
So with the first equation you are going to need to solve for "x". You are going to want to iqnore the secone expression till you solve for "x".
- 2x-1=13 add 1 on both sides
- +1 +1
- 2x=14
- [tex]\frac{2x}{2}=\frac{14}{2}[/tex] Then, divide 2 on both sides
- Which would give you "x=7"
Now that you finish that solvign the first equation you are going to plug "7" into "x" in the expression shown below
- [tex]-x^{2}-4x\\[/tex]
- [tex]-(7)^{2}-4(7)[/tex] we are going to solve the first part multiplying 7 by itself
- [tex]-7*7=-49[/tex] then we are going to solve the second part multiplying-4*7
- [tex]-4*7=-28[/tex] now we are going to add them both which gives us this.
- -49+-28=-77
And that is how le9045 got -77.
Hope this helped :)
