Question

plz guys solve this que​

Answer 1

Answer:

Step-by-step explanation:

proof:

BD=3CD

BD+CD=4CD          {ADDING CD}

BC=4CD

1/4BC=CD   ----------------(1)

3/4BC=BD   ----------------(2)

So,

AB²=AD²+BD²

AD²=AB²-BD²    -----------(3)

AC²=AD²+CD²

AD²=AC²-CD²   ------------(4)

AB²-BD²=AC²-CD²

AB²-AC²=BD²-CD²

AB²-AC²=(3/4BC)²-(1/4BC)²

AB²-AC²=(9-1)/16BC²

AB²-AC²=1/2BC²

2AB²-2AC²=BC²

2AB²=2AC²+BC²

HENCE PROVED

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