2 years ago

I'm thinking of a number. This number is 12 less than its square. What could my number be?

Mathematics

1 answer:

omeli [17]2 years ago

5 0

let nwmber to be X

the number is 12 less than it's square,

so X=12-X^2

=> X^2+X-12=0

=> (X+4)(X-3)=0

=>X= 3, or X=-4

in math we don't usually take negative numbers into account so your number would be 3

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Can anyone help me please?

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sdas [7]

Answer:

$y=-\frac{4}{3}x +\frac{26}{3}$

Step-by-step explanation:

1) if the point A has coordinates (-1;10) and the point B - (5;2), then it is possible to write common view of the required equation of the line:

$\frac{x-X_A}{X_B-X_A} =\frac{y-Y_A}{Y_B-Y_A};$

2) if to substitute the coordinates of A&B into the common equation, then:

$\frac{x+1}{5+1} =\frac{y-10}{2-10}; \ => \frac{x+1}{6}=\frac{y-10}{-8};$

3) finally, in slope-intersection form:

3y= -4x+26; ⇔ y= -4/3 x +26/3.

P.S. the suggested way of the solution is not the only one.

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