Which of the following is a solution of x2 - 7x = - 5? A. 7 plus or minus the square root of 69 divided by two. B. 7 plus or minus the square root of 29 divided by two. C. negative 7 plus or minus the square root of 29 divided by two. D. negative 7 plus or minus the square root of 69 divided by two.

Question

Mathematics

Princess Barrera

31 January, 08:37

Which of the following is a solution of x2 - 7x = - 5? A. 7 plus or minus the square root of 69 divided by two. B. 7 plus or minus the square root of 29 divided by two. C. negative 7 plus or minus the square root of 29 divided by two. D. negative 7 plus or minus the square root of 69 divided by two.

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Answers (1)

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Skyler Hays · Answer 1

X² - 7 x = - 5

x² - 7 x + 5 = 0

The standard form is : ax² + b x + c = 0

a = 1; b = - 7; c = 5

x 1/2 = (-b + / - √ (b²-4 ac) / 2a

x 1/2 = (7+/-√49 - 20) / 2 = (7 + / - √29) / 2

Answer: B) 7 plus or minus the square root of 29 divided by two.