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ss7ja [257]
3 years ago
11

Question 6 (1 point)

Mathematics
1 answer:
iris [78.8K]3 years ago
8 0

Answer:

-9√11

Step-by-step explanation:

Simplify 5√11-12√11-2√11

Applying,

The law of surd,

Step 1: factor out the common surd or irrational number i.e √11

√11(5-12-2)

√11(-9)

Step 2: Multiplying the whole number and the surd

-9√11

Therefore,

5√11-12√11-2√11 = -9√11

Hence the right option from the list of option is

c -9√11

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Simplify the following polynomial expression. (5x^4 - 9x^3 + 7x - 1) + (-8x^4 + 4x^2 - 3x + 2) - ( -4x^3 + 5x - 1)( 2x - 7)
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Answer: 5x^{4}-37x^{3}-6x^{2} +41x-6


Step-by-step explanation:

1. You must apply the Distributive property.  You need to remember the product property of exponents: If you multiply powers with the same base, you must add the exponents. Them you have:

=5x^{4}-9x^{3}+7x-1-8x^{4}+4x^{2}-3x+2-(8x^{4}+28x^{3}+10x^{2}-35x-2x+7)\\=5x^{4}-9x^{3}+7x-1-8x^{4}+4x^{2}-3x+2-8x^{4}-28x^{3}-10x^{2}+35x+2x-7

2. Now, you must add the like terms. Then, you obtain the following result:

=5x^{4}-37x^{3}-6x^{2} +41x-6



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Substitute the values from equation (1) and (2).

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