Can Homework Help Calculate the Electric Field from Two Point Charges?

deGallo
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Homework Statement
I am having trouble solving this question related to electric field.
Relevant Equations
I used k(q1/a^2 +q2/b^2) a=4.24 b=4 q1=1.6e-6 q2=2.4e-6
The answer I got is 2149 N/C (wrong)
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Hint: Electric field is a vector quantity.
 
To illustrate @TSny's point, if the charges had been ##q_1=9\mu C, q_2=-1\mu C##, your calculation would have said the field is zero.
 
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