How can I find the absolute value of a vector given in a specific form

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Looking forward to seeing if anyone can help me with this.

How can I find the absolute value of a vector given in this form:

$ \vec{v_1} = 2\vec{a} + 3\vec{b}$

As you can see it's not the typical $x\hat{i} + y\hat{j} + z\hat{k}$ form nor the $(x,y,z)$ form, so I can't really use the formula directly. Any ideas?