Question

plzz guy's solve it quickly ​

Answer 1

Answer:

11.53

Step-by-step explanation:

=> 217 - x^2 = x^2 - 49

=> 2x^2 = 266

=> x^2 = 266/2

=> x^2 = 133

=> x= 11.53

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Answer 2

X=21 and -8

Step-by-step explanation:

√(217-x)= x -7

by squaring both sides

217-x=(x-7)^2

217 - x = x² - 14x + 49

=> x² - 13x - 168 = 0

splitting the middle term we get,

=> x² +8x - 21x -168 = 0

=> x(x+8) - 21(x+8) = 0

=> (x-21)(x+8) = 0

=> (x-21) = 0 or (x+8) = 0

=> x = 21 or x = -8

Hence the solution to the given equation is x = 21 or x = -8

I hope it helps.

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