ABC26GN0410 · Number System
Subject: General Aptitude · Chapter: Number System · Exam: 2016 · Marks: · Difficulty:
Two consecutive even positive integers, sum of the squares of which is 1060, are
(a)12 and 14
(b)20 and 22
(c)22 and 24
(d)15 and 18
Answer
Explanation
Let, the two consecutive even numbers are $a$ and $(a+2)$, respectively According to question, $$\begin{aligned} & a^{2}+(a+2)^{2}=1060\left\{\because(a+b)^{2}=a^{2}+b^{2}+2 a b\right\} \\ & \Rightarrow a^{2}+a^{2}+4+4 a=1060 \\ & \Rightarrow 2 a^{2}+4 a-1056=0 \\ & \Rightarrow a^{2}+2 a-528=0 \\ & \Rightarrow a^{2}+24 a-22 a-528=0 \\ & \Rightarrow a(a+24)-22(a+24)=0 \\ & \Rightarrow(a-22)(a+24)=0 \\ & \Rightarrow a=-24,22 \end{aligned}$$
Explanation as extracted from the printed page; notation may be imperfect.
Open in whiteboard · Browse this chapter in the app