Question

solve the following quadratic equation by completing square x2+8x+9=0​

Answer 1

Answer:

$8 \: \: \: is \: answer$

Answer 2

" x² + 8x - 9 = 0

. => x² + 8x + 16 - 25 = 0

.=> ( x + 4 )² = 25

.(i)

.=> x + 4 = ± 5

.=> x = (-5-4) , (5-4)

.=> x = -9 or 1

.(ii)

.=> ( x + 4 )² - 25 = 0

.=> (x + 4 + 5) (x + 4 - 5) = 0

.=> (x + 9) (x - 9) = 0

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