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Rasek [7]
3 years ago
10

Why is x^4 - 16 when factored not just (x^2 + 4) (x^2 - 4)?

Mathematics
1 answer:
galben [10]3 years ago
4 0

Answer:

(x - 2)(x + 2)( {x}^{2}  + 4)

Step-by-step explanation:

{x}^{4}  - 16 \\  =  ({x}^{2})^{2}   -  ({2}^{2})^{2}   \\  = ( {x}^{2}  -  {2}^{2} )( {x}^{2}  +  {2}^{2} ) \\  = (x - 2)(x + 2)( {x}^{2}  + 4)

Because (x^2 - 4) = (x^2-2^2) can further be factorised as (x - 2) (x + 2).

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Which of the following are solutions to 2x2 – 8x - 90? Select all that apply.
Bond [772]

Answer:

x=-5, x=9

Step-by-step explanation:

we know that

The formula to solve a quadratic equation of the form

ax^{2} +bx+c=0

is equal to

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in this problem we have

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therefore

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3 years ago
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Answer:

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3 years ago
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