3 years ago

I need help! I will give brainliest if answered correctly

Mathematics

1 answer:

Inessa [10]3 years ago

8 0

Answer:

4 hrs and 8 mins

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telo118 [61]

Answer: Im pretty sure its C

Step-by-step explanation:

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3 years ago

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Simplify the expression. ( 5 x 2 − 3 x ) − ( 5 x 2 − 3 x + 1 )

iren [92.7K]

Answer:

-1

Step-by-step explanation:

Following PEMDAS The answer equals to -1

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3 years ago

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Solve x2 - 8x - 9 = 0. Rewrite the equation so that it is of the form x2 + bx = c.

barxatty [35]

Answer:

x=9,-1 and $x^2+(-8)x=9$

Explanation:

we have been given with the quadratic equation $x^2-8x-9$

we compare the given quadratic equation with general quadratic equation

general quadratic is $ax^2+bx+c=0$

from given quadratic equation a=1,b= -8,c= -9

substituting these values in the formula for discriminant $D=b^{2}-4ac$

$D=(-8)^2-4(1)(-9)=100$

Now, to find the value of x

Formula is $x=\frac{-b\pm\sqrt{D}}{2a}$

Now, substituting the values we will get

$x=\frac{-(-8)\pm\sqrt{100}} {2}= \frac{8\pm10}{2}=9,-1$

And rewritting the given equation by shifting 9 to right hand side of the given equation and taking minus inside the bracket so as to convert it in the form of

$x^2+bx=c$

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3 years ago

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Find the perimeter of a rectangle 12.5 cm. long and 3.5 cm wide

Anna [14]

12.5+3.5+12.5+3.5=32

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3 years ago

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Please can someone help me with this question.

saw5 [17]

Answer:

Step-by-step explanation:

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2 years ago

I need help! I will give brainliest if answered correctly​

I need help! I will give brainliest if answered correctly