BECE Mathematics 2021 Paper

Difference in mathematics means subtraction.Product means multiplication.Sum means addition.Hence difference between $(2 d)^2$ and $2 d^2$ implies $(2 d)^2-2 d^2$ NOTE: $\ln (2 d)^2$ the square (2) is affecting both 2 and $d$ since they are both in a bracket but in $2 d^2$, the square (2) only affects the $d$.$2 d$ means $2 \times d$$2 d^2$ means 2 times $d$ square, thus $2 \times d^2$$d^2=d \times d$Hence $2 d^2=2 \times d \times d$ In $(2 d)^2$, you can simplify the $2 d$ and when done square the result, thus multiply the result by itself.Since $d=3$, substitute 3 into wherever you see $d$ and simplify$\;2 d=2 \times d, \;\text{ but }\; d=3$$\;\Rightarrow 2 d=2 \times 3=6$$\;(2 d)^2=(2 \times 3)^2=6^2=6 \times 6=36$$\;2 d^2=2 \times 3^2=2 \times 3 \times 3=2 \times 9=18$$\;(2 d)^2-2 d^2=\{3 6\} \{- 1 8\}=18$