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Home Q & A Board Science-Related Homework Help Mathematics
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ilibee ilibee
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11 years ago
How do I solve these 2 problems using the method completing the square?

1. 2x^2+4x-3=0

2. 3x^2-9x=21

And how do I solve this problem using factoring?

23. 3x^2-4x-15=0

Just a couple homework problems that I'm stuck on.
Any help appreciated.
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2 Replies
Replies
wrote...
#1
11 years ago
23. 3x^2-9x+5x-15=0
3x(x-3)+5(x-3)=0
(3x+5)(x-3)=0

where (x-3)=0:
3x+5=0
x= -3/5

where (3x+5)=0
x-3=0
x=3

i hope im using the correct method, good luck
Answer accepted by topic starter
mickey74mickey74
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#2
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11 years ago
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