Mathematics: Whats the answer to 45=x(14-x)

Whats the answer to 45=x(14-x) - id45147466774, cecelia090

Ответ:

mkay78

01.02.2022

$45=x(14-x)\\ \\45=14x-x^2\\ \\x^2-14x+45=0\\ \\\Delta = b^{2}-4ac = (-14)^{2}-4*1* 45=196-180=16 \\ \\x_{1}=\frac{-b-\sqrt{\Delta }}{2a} =\frac{14- \sqrt{16}}{2}=\frac{14-4}{2}= \frac{12}{2}=6\\ \\x_{2}=\frac{-b+\sqrt{\Delta }}{2a} =\frac{14+\sqrt{16}}{2}=\frac{14+4}{2}= \frac{18}{2}=9$

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Ответ:

iBrain

01.02.2022

Mathematics

$45=x(14-x)\\\\45=x\cdot14-x\cdot x\\\\45=14x-x^2\\\\-x^2+14x-45=0\\\\a=-1;\ b=14;\ c=-45\\\\\Delta=b^2-4ac;\ \Delta=14^2-4\cdot(-1)\cdot(-45)=196-180=16\\\\x_1=\frac{-b-\sqrt\Delta}{2a};\ x_2=\frac{-b+\sqrt\Delta}{2a}\\\\x_1=\frac{-14-\sqrt{16}}{2\cdot(-1)}=\frac{-14-4}{-2}=\frac{-18}{-2}=9\\\\x_2=\frac{-14+\sqrt{16}}{2\cdot(-1)}=\frac{-14+4}{-2}=\frac{-10}{-2}=5$

$x=9\ or\ x=5.$

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Ответ:

kingo7

02.08.2022

Mathematics

1, 2, 3

Step-by-step explanation:

X <= 20 means that x has to be less than OR equal to 20.

The first option is -100. That's less than 20, so this statement is true.

The second option is 10. That's also less than 20, so this statement is also true.

The third option is 20. This is equal to 20, so this is also true.

The fourth option is 21, which is greater than 20, so it's not true.

The fifth option is 45, which is greater than 20, so it's not true.

Sorry I answered so late, hope this helps even though you probably don't need it anymore.

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