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1 year ago

(2x-2) (x+5) what does x =

Mathematics

2 answers:

Oksana_A [137]1 year ago

7 0

Answer:

(2x-2)=

+2 =+2

(2x)=2

----------

x= 1

-----------------------------------------------

(x+5)=

-5=-5

x= -5

Step-by-step explanation:

You just need to separate the variable from the numbers

Lynna [10]1 year ago

4 0

Answer:

the two roots of the equation take the form

−

√

−

So, start by adding

−

to both sides of the equation to get

−

Notice that you have

, and

−

. This means that the two solutions will be

−

√

−

⋅

(

−

)

⋅

−

√

You can simplify this if you want to get

−

√

≅

1.35078

and

−

√

≅

−

1.85078

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↓ ↓

A → → → → → → → → → → → C

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$a^2 = b^2 + c^2 - 2bc \ Cos A\\\\Cos \ A = \frac{b^2 + c^2 - a^2}{2bc} \\\\Cos \ A = \frac{40^2 + 59^2 - 21^2}{2 \times 40 \times 59} \\\\Cos \ A = 0.983\\\\A = Cos ^{-1} (0.983)\\\\A = 10.6 \ ^0$

Angle B is calculated as follows;

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$Cos \ C = \frac{a^2 + b^2 - c^2}{2ab} \\\\Cos \ C = \frac{21^2 + 40^2 - 59^2}{2 \times 21 \times 40} \\\\Cos \ C = -0.857\\\\C = Cos ^{-1} (-0.857)\\\\C = 149\ ^0$

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