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snow_lady [41]
3 years ago
12

What multiples to 42 and adds to -2

Mathematics
1 answer:
solniwko [45]3 years ago
4 0

Answer:

Step-by-step explanation:

xy = 42

x+y = - 2                   Substitute into the top equation

y = -2 - x                   Put in for y

x(-2 - x) = 42             Remove the brackets

-2x - x^2 = 42           Subtract 42 from both sides.

-2x - x^2 - 42 = 0      Put in the more normal order.

-x^2 - 2x - 42 = 0      Multiply by -1

x^2 + 2x + 42 = 0

This cannot be factored. It gives complex roots as it is written. I will give you the answer but I kind of doubt the question is correct.

x1 = - 1 + 6.40i

x2 = -1 - 6.40i

Leave a comment if you have a correction.

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GREYUIT [131]

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Answer:

a=-3

Step-by-step explanation:

we have

a-2=\frac{3+6a}{3}

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That means ----> Isolate the variable a

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a-2=\frac{3(1+2a)}{3}

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subtract a both sides

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Zinaida [17]

Answer:

I would say that they are different because if x - a has a value to the equation then that means a - x will not have the same value because it may be rearranged to a different equation but that doesn't mean that they will have the same value. that explain why x - a and a - x are not the same

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Answer:

it is c

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c

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Three fourths of x increased by 5 is - 7​
Finger [1]

Answer:

x=\frac{8}{3}

Step-by-step explanation:

\frac{3}{4} x+5=7

Subtract 5 from both sides.

\frac{3}{4}x+5-5=7-5

Simplify.

\frac{3}{4}x=2

Multiply both sides by 4.

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Divide both sides by 3.

\frac{3x}{3} =\frac{8}{3}

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