3 years ago

PLS HELP IM TIMED!! ILL MARK U BRAINLIEST

Mathematics

2 answers:

netineya [11]3 years ago

6 0

Answer:

Step-by-step explanation:

7x² - 56x = 63 ( divide through by 7 )

x² - 8x = 9

To complete the square

add ( half the coefficient of the x- term )² to both sides

x² + 2(- 4)x + 16 = 9 + 16

(x - 4)² = 25 ( take square root of both sides )

x - 4 = ± $\sqrt{25}$ = ± 5 ( add 4 to both sides )

x = 4 ± 5

Then

x = 4 - 5 = - 1

x = 4 + 5 = 9

solutions are (- 1, 9 ) → D

pashok25 [27]3 years ago

3 0

Answer:

Step-by-step explanation:

I looked up the answer

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