Question

Question 3(b)

Pick out the solution from the values given in the bracket next to each equation. Show that the other values do not satisfy the equation.

n + 12 = 20 (12, 8, 20, 0)

Answer 1

Given equation is n + 12 = 20

$\begin{array}{cc}Valueofn& Valueof(n+12)\\ & \\ \left(i\right)12& 12+12=24\\ & \\ \left(ii\right)8& 8+12=20\\ & \\ \left(iii\right)20& 20+12=32\\ & \\ \left(iv\right)0& 0+12=12\\ & \end{array}$

Only case (ii) is satisfying the given equation.

$\therefore$ n = 8 is the solution.