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Lynna [10]
3 years ago
15

Solve 3x2 18x 15 = 0 by completing the square.

Mathematics
1 answer:
iren2701 [21]3 years ago
3 0
3(x^2 + 6x + 5) = 0
3(x^2 + 6x + 9 + 5 - 9) = 0
3(x + 3)^2 + 3(-4) = 0
3(x + 3)^2 - 12 = 0
3(x + 3)^2 = 12
(x + 3)^2 = 4
x + 3 = sqrt(4)
x = -3 + or - 2
x = -3 + 2 or -3 - 2
x = -1 or -5
The correct answer option is option c.
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Answer with Step-by-step explanation:

Since we have given that

a + b = c

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We need to prove that a|b.

⇒ a = mb for some integer m

Since a|c,

So, mathematically, it is expressed as

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Now, we put the above value in a + b = c.

So, it becomes,

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