Sam has an I-tunes card to purchase music after purchasing 7 songs his balance on the card is 41.25. The balance of the card was
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Answer:
D
Step-by-step explanation:
Given
x² - 10x = - 36
Solve using the method of completing the square
add ( half the coefficient of the x- term )² to both sides
x² + 2(- 5)x + 25 = - 36 + 25
(x - 5)² = - 11 ( take the square root of both sides )
x - 5 = ± ( add 5 to both sides )
x = 5 ± i
Thus
x = 5 - i or x = 5 + i