A sequence is defined recursively by the formula f(n + 1) = –2f(n). The first term of the sequence is –1.5. What is the next term in the sequence? –3.5
–3
0.5
3

Which is the first error that Tomas made?

Tomas substituted the 3 for x when he should have substituted 6 for x.
Tomas added 6 to both sides of the equation instead of subtracting 6.
Tomas should have written the equation as .
Tomas substituted 3 for x when he should have substituted 3 for y.