Mason G. answered 09/22/16
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This is a Pythagorean Theorem problem. It helps to draw a picture of the situation; you will see it is a triangle.
35 = a
x = b
3x + 1 = c
a2+b2= c2
352+x2=(3x+1)2
Can you solve it from there?
Let me know if you would like more help!
Amber S.
09/22/16