<span>Which decimal does not round to 10?
I am not sure but if the teacher allows you to pick more than one choice, circle all because I think none of them is rounded to 10.</span>

4 0

3 years ago

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Which are the solutions of x2 = –7x – 8?

Yanka [14]

You can start by rewriting the equation so that the right side equals zero. Add $-7x$ and $8$ to both sides.

$x^2+7x+8=0$

You can now use the quadratic equation (below), where $a=1, b=7,$ and $c=8$ , to find solutions. Plug in these values for $a, b,$ and $c$ into the equation and simplify.

$\frac{-b \pm \sqrt{b^2-4(ac)}} {2a}$
$\frac{-7 \pm \sqrt{7^2-4(1 \times 8)}} {2 \times 1}$
$\frac{-7 \pm \sqrt{49-32}} {2}$
$\frac{-7 \pm \sqrt{17}} {2}$

The final answer is the combination of both solutions.
$x=\frac{-7}{2} \pm \frac{\sqrt{17}} {2} \approx -3.5 \pm 2.06.$

Or approximately...
$x=(-3.5-2.06) \approx -5.56, (-3.5+2.06) \approx-1.44$

8 0

3 years ago

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Find the sum of – 7x2 - 6x + 9 and - 3x2 - x + 7.

marusya05 [52]

Answer:

-7x - 4

Step-by-step explanation:

(-7 x 2) - 6x + 9 + (-3 x 2) - x + 7

-14 - 6x + 9 - 6 - x + 7

-7x - 4

4 0

3 years ago