Question

if a=root 2+7 b= root 2-7 find x=a+b and y=a-b​

Answer 1

Answer:

⇒x(x

2

−12)−3(2x−14)+7(12−7x)=0

⇒x

3

−67x+126=0

if x=−9

(−9)

3

−67(−9)+126=−729+729=0

∴(x+9) is the factor of x

3

−67x+126

⇒x

3

−67x+126=(x+9)(x

2

−9x+14)

⇒ other two roots a,b are 2,7

∴ab=14

Answer 2

Answer:

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Step-by-step explanation:

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