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Mathematics
Lorena Herrera
24 October, 19:34
A^2+5a-24=0 solve the equation by factoring
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Triston Harding
24 October, 20:29
0
(a + 8) (a - 3)
You should think about what numbers multiply together to give - 24 but add together to give you + 5.
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Rebecca
24 October, 20:29
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According to his answer above, the factor is (a+8) (a-3). To solve for a, we could see what can give 0 when we multiply the factor. In (a-3), 3 can be subtracted by 3 which is 0, then is being multiplied by another factor, which is still 0. So let's plug 3 as a in our equation. 3^2+5 (3) - 24=0 is 9+15-24. Simplify. 9+15-24 is 0, so 3 can be an answer to our equation. Now let's see what can we add in (a+8) to get 0. That is - 8, because - 8+8=0. Now let's try in our equation. - 8^2+5 (8) - 24 is 64+40-24. Simplify. 84-24 which is 60. So - 8 can not be a possibility. Therefore 3 is the only answer.
Real answer: a=3
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