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Mathematics
Orr
28 August, 03:39
Complete the square x^2-10=16
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Jerimiah Briggs
28 August, 03:59
0
(x - 5) ² = 41
Step-by-step explanation:
* Lets revise the completing square form
- the form x² ± bx + c is a completing square if it can be put in the form
(x ± h) ², where b = 2h and c = h²
# The completing square is x² ± bx + c = (x ± h) ²
# Remember c must be positive because it is = h²
* Lets use this form to solve the problem
∵ x² - 10x = 16
- Lets equate 2h by - 10
∵ 2h = - 10 ⇒ divide both sides by 2
∴ h = - 5
∴ h² = (-5) ² = 25
∵ c = h²
∴ c = 25
- The completing square is x² - 10x + 25
∵ The equation is x² - 10x = 16
- We will add 25 and subtract 25 to the equation to make the
completing square without change the terms of the equation
∴ x² - 10x + 25 - 25 = 16
∴ (x² - 10x + 25) - 25 = 16 ⇒ add 25 to both sides
∴ (x² - 10x + 25) = 41
* Use the rule of the completing square above
- Let (x² - 10x + 25) = (x - 5) ²
∴ (x - 5) ² = 41
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