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3 years ago

X squared minus 9x plus 20 equals 0

Mathematics

2 answers:

kodGreya [7K]3 years ago

5 0

X^2- 9x+ 20 =0 factor (x-5) (x-4) =0 set each factor to 0 x-4=0 x=4 x-5= 0 x=5 hope this helps

Marina86 [1]3 years ago

3 0

X²-9x+20=0
(x-4)(x-5)=0
x₁=4
x₂=5
Answer: x₁=4, x₂=5

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Answer:

Step-by-step explanation:

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3 years ago

-25^-1/2 with explanation please

slavikrds [6]

Answer:

The simplified value of $-25^{-\frac{1}{2}}$ is $-\frac{1}{5}$ .

Step-by-step explanation:

As the given expression is

$-25^{-\frac{1}{2}}$

Lets simplify this expression step by step

$-25^{-\frac{1}{2}}....[A]$

$\mathrm{Apply\:exponent\:rule}:\quad \:a^{-b}=\frac{1}{a^b}$

$25^{-\frac{1}{2}}=\frac{1}{25^{\frac{1}{2}}}$

So, lets plug $25^{-\frac{1}{2}}=\frac{1}{25^{\frac{1}{2}}}$ in equation [A] i.e. $-25^{-\frac{1}{2}}....[A]$

$-25^{-\frac{1}{2}}....[A]$

$=-\frac{1}{25^{\frac{1}{2}}}$ ∵ $25^{-\frac{1}{2}}=\frac{1}{25^{\frac{1}{2}}}$

$=-\frac{1}{5}$ ∵ $25^{\frac{1}{2}}=5$

Therefore, the simplified value of $-25^{-\frac{1}{2}}$ is $-\frac{1}{5}$ .

Keywords: simplification, exponent rule

Learn more about expression simplification from brainly.com/question/13848834

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3 years ago

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