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x2 - 81

first you split it apart by writing to separate paranthesis.

( )( )

second since you have two x's you write them first in both paranthesis

(x )(x )

third you recognize what number multiplied by what number equals 81. and also these numbers when added or subtracts need to equal zero. many things multiply to equal 81 but only 9 and 9 multiply to equal 81 and also subtract to equal zero.

(x 9)(x 9)

fourth you haveto figure out the sign. do you put a plus or minus in either one or both. you have to put a minus is one and a plus in the other because you need one positive and one negative so you will get 9x-9x=0 and 9 * -9 = -81

(x - 9)(x + 9) is your answer

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13y ago
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13y ago

(9x + 5)(9x - 5)

That is a special polynomial called the difference of 2 squares

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8y ago

9(3x + 1)(3x - 2)

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11y ago

9(9x + 2)

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Q: Factor the polynomial 81x2-25
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