3 years ago

Kyndal wants to buy a lamp that

Mathematics

1 answer:

fenix001 [56]3 years ago

5 0

Answer:

$39.36

Step-by-step explanation:

Since its 20% off that means we still have a remaining 80% so first multiply 0.8 to the 82

82x0.8= 65.6

Since there is a additional 40% off multiply by 0.4 to get the discount amount

65.6x0.4= 26.24

Subtract the discount from the price

65.6-26.24= 39.36

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What is the product of -2x^2 + x - 5 and x^3 - 3x - 4 ? Show your work.

NISA [10]

For this case we must find the product of the following expressions: $(-2x ^ 2 + x-5) (x ^ 3-3x-4) =$

We must apply distributive property, that is, multiply each term:

We must bear in mind that:

$+ * - = -\\- * - = +$

$-2x ^ {2 + 3} + 6x^{2 + 1} + 8x ^ 2 + x^{3 + 1} -3x^{1 + 1} -4x-5x ^ 3 + 15x + 20 =\\-2x ^ 5 + 6x ^ 3 + 8x ^ 2 + x ^ 4-3x ^ 2-4x-5x ^ 3 + 15x + 20$

If we multiply $(x ^ 3-3x-4) (- 2x ^ 2 + x-5)$ we would obtain the same result according to the commutative property of the multiplication:

$a * b = b * a$

Answer:

$-2x ^ 5 + 6x ^ 3 + 8x ^ 2 + x ^ 4-3x ^ 2-4x-5x ^ 3 + 15x + 20$

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