2 years ago

Question 9 of 10

Mathematics

1 answer:

BaLLatris [955]2 years ago

3 0

(x-3)²=5

x²-6x+9= 5

x²-6x+9-5=0

x²-6x+4=0

D=b²-4ac

= (-6)²-4×1×4

=36-16

= 20

x1=(-b-VD)/2a

= (6-V20)/2

=( 6- V4 × V5)/2

= (6-2V5)/2

= 3-V5

x2= (-b+VD)/2a

= (6+2V5)/2

= 3+V5

-> answer A

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