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4 years ago

What expression is equal to 7(3 - x) + 1?

Mathematics

1 answer:

Nesterboy [21]4 years ago

5 0

7(3-x)+1 .. first you're going to distribute

21-7x+1 .. then combine like terms

22-7x .. subtract 22 from both sides to get the variable X alone.

-7x=-22

x=3.14

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OlgaM077 [116]

Answer: The missing length is 16/3

Step-by-step explanation:

First, you have to find the proportional value between the two lengths on the first figure and the two lengths on the second figure.

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4 years ago

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3 years ago

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Savatey [412]

use $a^2-b^2=(a+b)(a-b)$

to get $(\cos^3A-\sin^3A)(\cos^3A+\sin^3A)$

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also, $\sin^2\theta+\cos^2\theta=1$

to get $(\cos A-\sin A)(1+\sin A\cos A)(\cos A+ \sin A)(1-\sin A\cos A)$

then again use the first identity In both pairs, i.e.

$(\cos A-\sin A)(\cos A+ \sin A) \cdot (1+\sin A\cos A)(1-\sin A\cos A)$

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