Step 1:
Write the expression
b + ac - a
Step 2:
write the given data
a = -2 , b = 6 and c = -4
Step 3:
substitute the values in the expression.
[tex]\begin{gathered} b\text{ }+\text{ ac - a} \\ =\text{ 6 + (-2 }\times\text{ -4 ) - (-2)} \\ =\text{ 6 + 8 + 2} \\ =\text{ 16} \end{gathered}[/tex]Final answer
16
