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3 years ago

4x2 + 3 = -7x solve for xx=_,_

1 answer:

3 0

$\displaystyle\bf 4x^2+3=-7x\\4x^2+7x+3=0 \\\\D=49-48=1 \\x_1=\frac{-7+1}{8} =-\frac{3}{4} \\x_2=\frac{-7-1}{8} =-1\\\\Answer: \boxed{ x_1=-\frac{3}{4} \quad ; \quad x_2=-1}$

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Which choice is equivalent to the expression below?

morpeh [17]

Answer:

Step-by-step explanation:

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thus, we have it that;

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3 0

3 years ago

Which of the following is NOT a variation of a Pythagorean identity?

Ipatiy [6.2K]

The expression that is not a variation of the Pythagorean identity is the third option.

<h3>What is the Pythagorean identity?</h3>

The Pythagorean identity can be written as:

$sin^2(x) + cos^2(x) = 1$

For example, if we subtract cos^2(x) on both sides we get the second option:

$sin^2(x) = 1 - cos^2(x)$

Which is a variation.

Now, let's divide both sides by cos^2(x).

$sin^2(x)/cos^2(x) + cos^2(x)/cos^2(x) = 1/cos^2(x)\\\\tan^2(x) + 1 = sec^2(x)\\\\tan^2(x) - sec^2(x) = -1$

Notice that the third expression in the options looks like this one, but the one on the right side is positive. The above expression is in did a variation of the Pythagorean identity, then the one written in the options (with the 1 instead of the -1) is incorrect, meaning that it is not a variation of the Pythagorean identity.

Concluding, the correct option is the third one.

If you want to learn more about the Pythagorean identity, you can read:

brainly.com/question/24287773

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3 years ago

Find the number of distinct triangles with the measurements a = 5, b =2, and a = 51 degrees.

elixir [45]

The answer is the option b. 1.

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When that is the case you use the cosine rule.

When the known angle is not between the two sides but one of the others, you use sine theorem.

Then in any case when you know two sides and one angle of a triangle the other side and angles are determined, which implies that there is only one possible triangle.

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3 years ago

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Tems11 [23]

Answer:

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3 years ago

Answer asap plz plz ok thx

Aleksandr-060686 [28]

Answer:

2. A
3. B

Step-by-step explanation:

<u>Option A is correct:</u>

Two pairs of opposite congruent angles

<u>Option B is correct:</u>

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3 years ago

4x2 + 3 = -7x solve for xx=_,_​

4x2 + 3 = -7x solve for xx=_,_