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Chapter 9: Q. 9.34 TI (page 880)

Solve by completing the square :

(d-7)(d+3)=56

Short Answer

Expert verified

The required value ofdis11,-7

Step by step solution

01

Given information

(d-7)(d+3)=56

02

Calculation

(d-7)(d+3)=56鈬�d(d+3)-7(d+3)=56鈬�d2+3d-7d-21=56鈬�d2-4d=56+21鈬�d2-4d=77鈬�d2-4d+(12脳(-4))2=77 鈬�d2-4d+4=77+4鈬�(d-2)2=81 鈬�d-2=卤81鈬�d-2=卤9鈬�d=2卤9=2+9,2-9=11,-7

The required value ofdis11,-7

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