Question

2x - 3 = √20^2 - 2x + 21​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

6 or -1

Step-by-step explanation:

(2x-3) ^2=√2x-2x+21

4x^2-12x+9= 2x^2-2x+21

4x^2-2x^2-12x+2x+9-21=0

2x^2-10x-12=0

D= (-10) ^2-4×2×-12

D=196

by quadratic formula:

x=10+_√196/2×2

x= 10+_14/4

x= 24/4 or -4/4

x= 6 or -1