Pls solve the first question

x2+5x-a2+a-6=0x2+5x-a2+3a-2a-6=0x2+5x-aa+3-2a+3=0x2+5x-a+3a-2=0x2+a+3-a-2x-a+3a-2=0x2+a+3x-a-2x-a+3a-2=0xx+a+3-a-2x+a+3=0x+a+3x-a-2=0x+a+3=0 or x-a-2=0x=-a+3 or x=a-2

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x2+5x- (a2+a-6)=0
D=b2-4ac
​=52-4(1)-(a2+a-6)
=25+4a​2+4a-24
=4a2+4a+1
=(2a+1)2
 
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