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3 years ago

Pls answer you dont have to show work

Mathematics

1 answer:

Vlada [557]3 years ago

8 0

Answer:

Option C, 6.5

Step-by-step explanation:

Step 1: Substitute y in the equation 3x - 5y = 22

3x - 5y = 22

3x - 5(-5x + 32) = 22

3x + 25x - 160 + 160 = 22 + 160

28x / 28 = 182 / 28

x = 6.5

Answer: Option C, 6.5

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Answer:

See Explanation

Step-by-step explanation:

Question like this are better answered if there are list of options; However, I'll simplify as far as the expression can be simplified

Given

$sec^4 x + sec^2 x tan^2 x - 2 tan^4 x$

Required

Simplify

$(sec^2 x)^2 + sec^2 x tan^2 x - 2 (tan^2 x)^2$

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Represent $tan^2x$ with b

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Factorize

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Recall that

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In trigonometry

$sec^2x =1 +tan^2x$

Subtract $tan^2x$ from both sides

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Substitute 1 for $sec^2x - tan^2x$ in $(sec^2x -tan^2x) (sec^2x+ 2 tan^2x)$

$(1) (sec^2x+ 2 tan^2x)$

Open Bracket

$sec^2x+ 2 tan^2x$ ------------------This is an equivalence

$(secx)^2+ 2 (tanx)^2$

Solving further;

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Substitute the expressions for secx and tanx

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Open bracket

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Add Fraction

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