Solve this quadratic equation by completing the square
x^2+6x=18
2 answers:
Answer:
( x + 3 )² - 27
Step-by-step explanation:
x² + 6x = 18
→ Minus 18 from both sides to get a quadratic equation
x² + 6x - 18
⇒Completed square from is ( x + a )² + b
⇒The value of 'a' will always be half the 'b' value in the equation
ax² + bx + c
→( x + 3 )² + b
Expand out the equation to find 'b'
x² + 6x + 9
We have do something to get from 9 to - 18 which -27
So the answer is ( x + 3 )² -27
Answer:
-8.20 (3sf) , 2.20 (3sf)
Step-by-step explanation:
x2 + 6x = 18
halve the coefficient of x and square it, in this case it is ( 6 / 2 )2 which is 9)
x2 + 6x + 9 - 9 = 18
+ 9 on both sides,
( x + 3 )2 =27
ok now sq. root both sides
x + 3 = ± 
x + 3 = ± 5.196 (4 sf)
x = -8.20 (3 sf) or x = 2.20 (3sf)
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(x+8)(x-1)
Check:
8-1=7
8*-1=-8
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12x - 56 = y. Hope it helps! :) If you could vote my answer as the brainiest, that would be awesome! :)
You would time the denominator by 3 so 11*3 would be 33 then times the numerator by the same so 6*3 soot would be 18/33
Answer:
2n + 11
Step-by-step explanation:
You can combine 4n and -2n.
You get 2n + 11
