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lorasvet [3.4K]
3 years ago
12

Which of the following expressions is equal to 2x2 + 18 ?

Mathematics
1 answer:
ehidna [41]3 years ago
4 0
<h3>Answer: Choice C. (2x - 6i)(x + 3i)</h3>

Work Shown:

2x^2 + 18

2(x^2 + 9)

2(x - 3i)(x + 3i) .... see note below

(2x - 6i)(x + 3i)

Note: I used the rule that a^2 + b^2 = (a - bi)(a + bi). I recommend FOILing out the right hand side to confirm the equation is true. You'll use the idea that i^2 = -1.

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8 0
3 years ago
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The base of a solid oblique pyramid is an equilateral triangle with a base edge length of 18 inches What is the height of the tr
ExtremeBDS [4]
The height of the triangular base of the pyramid is calculated through the equation,
                                        h = (cos x)(18 in)
where h is height and x is half of the angle of the triangle. Since the triangle is equilateral, the value of  x is 30°. Substituting,
                                        h = (cos 30°)(18 in)
                                        h = 15.59 in
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the answer is 38200000

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Parallelogram DEFG is transformed to parallelogram VSTU.
nata0808 [166]

A, because a pre-image means an image before its altered, and VSTU would be the image as a result of DEFG being transformed

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