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skelet666 [1.2K]
3 years ago
15

F(x)=x^2+2x-24? How to solve

Mathematics
1 answer:
sineoko [7]3 years ago
5 0

Step-by-step explanation:

F ( x ) = x² + 2x - 24

{ factorising by middle term splitting method }

[ 24 = 2 × 2 × 2 × 3 ]

F ( x ) = x² + 6x - 4x - 24

F ( x ) = x ( x + 6 ) -4 ( x + 6 )

F ( x ) = ( x + 6 ) ( x - 4 )

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We have to add numbers without a calculator.

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We can group them by the last digit, so they are easy to add:

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2) 101, 73, 49, 27, 24, 36

We can group them again by the last digit (adding 10, like the previous example).

We can substract the last digit from one number and add it to the other one. The result will be the same, but they will become easier to add.

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In this case we have 3 times the same numbers, so we can add the three different numbers and then multiply the total by 3.

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