2 years ago

One of the solutions to the equation 5x^2+bx+12=0 is − 4/5. Find the other solution.

Mathematics

1 answer:

gayaneshka [121]2 years ago

3 0

Answer:

b=-19

Step-by-step explanation:

We know that one of the solutions is x=-4/5

That is a solution to x. So if we plug in (-4/5) into the x in the equation, then it should equal 0.

5(-4/5)^2+b(4/5)+12=0

Now, just solve for b.

5(16/25)+b(4/5)+12=0

(16/5)+(4/5)b+12=0

(76/5)+(4/5)b=0

(4/5)b=-(76/5)

b=-19

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