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hoa [83]
3 years ago
11

What are the solutions to the quadratic equation 3x2 + 15x – 18 = 0?

Mathematics
1 answer:
Natasha_Volkova [10]3 years ago
8 0
First divide by 3 because we don't want any factor in front of the x² when doing factorization:

3x² + 15x – 18 = 0 => x² + 5 - 6 = 0

Then find the two numbers that multiply to -6 and add up to +5:

x² + 5 - 6 = 0 => (x-1)(x+6) = 0

So the solutions are x=1 or x=-6, that's answer B.
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