JAMB Mathematics 2017 Paper

Concept:Direct substitution: replace the variable $x$ with $2$ and simplify using the order of operations, with multiplication before addition.Explanation:Write the expression clearly as $x + x(xx)$.Notice that $xx$ means $x$ multiplied by itself, so $xx = x^2$.Substitute $x = 2$ everywhere into the expression.The first $x$ becomes $2$, the multiplier outside the bracket becomes $2$, and the bracket $xx$ becomes $2^2$.Hence the expression is rewritten as $2 + 2(2^2)$.Evaluate the power first: $2^2 = 4$.Then multiply: $2 \times 4 = 8$.Lastly, perform the addition: $2 + 8 = 10$.The correct option is B.Answer:The value is $10$ (Option B).