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2 years ago

7

I need help solving this! I need and answer fast

1 answer:

shusha [124]2 years ago

3 0

Solve the porportions. First, cross multiply

7/(x - 4) = 42/12

(7/(x-4))(x-4)(12) = (42/12)(12)(x-4)

7(12) = 42(x-4)

Simplify. (remember to distribute the 42 to both x and -4

84 = 42x - 168

Isolate the x. First add 168 to both sides

84 (+168) = 42x - 168 (+168)

42x = 84 + 168

42x = 252

Finally, isolate the x by dividing 42 from both sides

42x/42 = 252/42

x = 252/42

x = 6

6 is your answer

hope this helps

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Step-by-step explanation:

<u><em>The correct question is</em></u>

What is the sum of the roots of 20x^2-10x-30

we know that

In a quadratic equation of the form

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in this problem we have

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substitute

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<u><em>Verify</em></u>

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substitute

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