Class 10 Maths | Quadratic Equations Exercise 3 Q 3 - video Dailymotion

SUJIT SOLANKI

Class 10 Maths | Quadratic Equations Exercise 3 Q 3

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00:00Dear friends, in this video I will teach you how to solve this question.

00:09Is it possible to design a rectangular mango groove whose length is twice its breadth?

00:19And the area is 800 meter square.

00:24If so, find length and breadth.

00:26So we have to find length and breadth.

00:28First of all, this is our rectangular mango groove.

00:34Ok.

00:35Now in which we have two sides.

00:39One is our breadth and one is our length.

00:44If we suppose let breadth be x meter.

00:57Then the relation is given, the length is twice its breadth.

01:03Length is equal to what?

01:04Two times breadth.

01:06Length is equal to two times breadth.

01:13Ok.

01:14Now area.

01:15What is area?

01:16Length into breadth.

01:20Area is given 800 meter.

01:22What is length?

01:23Two x.

01:24What is breadth?

01:25X.

01:26Two x into x is equal to what?

01:29Two x square.

01:31So we have 800.

01:32So we have 800 is equal to 2 times x square.

01:38So we have to remove 2 from both sides.

01:42So we have to divide 2 from both sides.

01:462 into 2, 2 cancer.

01:472 into 2, 4.

01:494 into 2, 8.

01:500, 0.

01:51So we have 400 is equal to x square.

01:53So we have plus and minus 20.

02:00We have plus and minus 20.

02:02We have plus and minus 20.

02:0420 into 20 is equal to 400.

02:06Is equal to x.

02:08So what is breadth?

02:10is equal to 20 meter.

02:16And what is length?

02:17Length is equal to 2 time.

02:20Length is equal to 2 time breadth.

02:27That is 40 meter.

02:31Ok.

02:3240 into 20 is equal to 800.

02:35So our answer is correct.

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Class 10 Maths | Quadratic Equations Exercise 3 Q 3

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