Answer:
X=20.6666
Step-by-step explanation:
26
3x^2 + 7x
when x = 2,
=> 3(2)^2 + 7(2)
=> 3(4) + 14
=> 12 + 14
=> 26
The sum of 5 and 8 is 13.
Unknown number is x
So 13x=42
x=4
