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lawyer [7]
3 years ago
9

Write the equation it is parallel to the graph of y=-2x-10 and passes through (-1,2)

Mathematics
1 answer:
finlep [7]3 years ago
3 0

Step-by-step explanation:

y= -2x

that is the answer

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Write the quadratic equation whose roots are 1 and -5, and whose leading coefficient is 3.
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Step-by-step explanation:

they're is a neat little trick.

but first of all, "roots" means the 0 solutions of the equation. like

ax² + bx + c = 0

there are 2 solutions for x to make the whole expression equal 0.

these are the "roots".

now to the little trick :

when is a multiplication resulting in 0 ?

when at least one of the factors is 0.

and any quadratic expression can be written as multiplication of 2 factors. like

c(x - a)(x - b) = cx² - cax - cbx + cab

what are the "roots" or 0 points ?

either

c = 0

x - a = 0 | x = a

x - b = 0 | x = b

the leading coefficient = 3.

that means nothing else than c = 3.

root = 1 means (x - 1) is one factor.

root = -5 means (x + 5) is the other factor.

so, we have

3(x - 1)(x + 5) = 3x² + 12x - 15

and the equation is

3x² + 12x - 15 = 0

or

3x² + 12x = 15

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Step-by-step explanation:

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