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Question

In the following figure, ABC=90,AB=(x+8) cm,BC=(x+1) cm and AC=(x+15) cm.
Find the value of x.
187903_e39db5539b9149a0b13d68d8b7986e7b.png

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Solution

In a right angled triangle, Hypotenuse2=base2+height2
So, AC2=AB2+BC2
(x+15)2=(x+8)2+(x+1)2
x2+225+30x=x2+64+16x+x2+1+2x
225+30x=x2+65+18x
x216012x=0
x220x+8x(20×8)=0
x(x20)+8(x20)=0
(x20)(x+8)=0
x=20 or x=8
Since, length cannot be negative,
x=20

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