Answer:
8.5
Step-by-step explanation:
Our current equation is:
x2 + 3x.
Let's replace all the x with 1.7.
1.7(2) + 3(1.7)
Let's solve this new equation normally, as if the 1.7 was always there.
1.7(2) = 3.4
3(1.7) = 5.1
Now, let's add both the products.
5.1 + 3.4 = 8.7
Therefore, we can conclude the answer is 8.7.
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