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dlinn [17]
2 years ago
15

7- Simplify each expression. -8+2(-5)

Mathematics
2 answers:
DIA [1.3K]2 years ago
4 0
To simplify, we use PEMDAS. Since a number near a parentheses means multiplication, and there is no other operations that we need to do first, we do the multiplication first. 2(-5) = 2*(-5) = -10.
Next we add -8 and -10. -8+(-10) is the same as -8-10, which is -18. Hope this helps
postnew [5]2 years ago
3 0

Answer:

-18

Remember PEMDAS.

Step-by-step explanation:

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Answer:

The answer is below

Step-by-step explanation:

We need to prove that:

(Root of Sec A - 1 / Root of Sec A + 1) + (Root of Sec A + 1 / Root of Sec A - 1) = 2 cosec A.

Firstly, 1 / cos A = sec A, 1 / sin A = cosec A and tanA = sinA / cosA.

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\frac{\sqrt{secA-1} }{\sqrt{secA+1} } +\frac{\sqrt{secA+1} }{\sqrt{secA-1} } =\frac{(\sqrt{secA-1)}(\sqrt{secA-1})+(\sqrt{secA+1)}(\sqrt{secA+1}) }{(\sqrt{secA+1})(\sqrt{secA-1}) } \\\\=\frac{secA-1+(secA+1)}{\sqrt{sec^2A-secA+secA-1} } \\\\=\frac{2secA}{\sqrt{sec^2A-1} } \\\\=\frac{2secA}{\sqrt{tan^2A} } \\\\=\frac{2secA}{tanA} \\\\=\frac{2*\frac{1}{cosA} }{\frac{sinA}{cosA} }\\\\= 2*\frac{1}{cosA}*\frac{cosA}{sinA}\\\\=2*\frac{1}{sinAA}\\\\=2cosecA

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3 years ago
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Step-by-step explanation:

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