(x-5)^2- (x+2)^2 =-2
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(x + 5)² - (x + 2)²
= x² + 25 + 10x -( x² +4 +4x)
= x² + 25 + 10x - x² - 4 - 4x
= 6x - 21
= - 2 ( Given in question )
ATQ.
6x - 21 = -2
=>6x = -2 +21
=> 6x = 19
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