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3 years ago

If x = 3, then the value of 2x + 7 - x is?

Mathematics

1 answer:

alekssr [168]3 years ago

8 0

Answer:

Step-by-step explanation:

Given 2x + 7 - x when x = 3

2(3) + 7 - 3

6 + 7 - 3

6 + 4

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I need the solution

Nataly [62]

The only thing you can do here is to try to simplify, so I'll assume that's what you want to do.

$\dfrac{b^2-a^2}{2a^2+ab-3b^2}$

The numerator is a difference of squares, so it's easy to factorize:

$b^2-a^2=(b-a)(b+a)$

In the denominator, we factorize by grouping:

$2a^2+ab-3b^2=2a^2-2ab+3ab-3b^2=2a(a-b)+3b(a-b)=(2a+3b)(a-b)$

So we have

$\dfrac{b^2-a^2}{2a^2+ab-3b^2}=\dfrac{(b-a)(b+a)}{(2a+3b)(a-b)}=-\dfrac{b+a}{2a+3b}$

5 0

4 years ago

P=(\frac{\sqrt{x} +2}{x-1}+\frac{\sqrt{x}\\ -2}{x-2\sqrt{x} +1} ) : \frac{4x}{(x-1)^{2} }

balandron [24]

The solution to the division of the given surd is: $\mathbf{P =\dfrac{(6\sqrt{x}-x^2\sqrt{x}-3x\sqrt{x}+2x+2)(x-1) }{8x} }$

<h3>Division of Surds.</h3>

The division of surds follows a systemic approach whereby we divide the whole numbers separately and the root(s) are being divided by each other.

Given that:

$\mathbf{P=(\frac{\sqrt{x} +2}{x-1}+\frac{\sqrt{x}\\ -2}{x-2\sqrt{x} +1} ) : \frac{4x}{(x-1)^{2} }}$

i.e.

$\mathbf{=\dfrac{(\frac{\sqrt{x} +2}{x-1}+\frac{\sqrt{x}\\ -2}{x-2\sqrt{x} +1} )}{ \frac{4x}{(x-1)^{2} }} }$

Using the fraction rule:

$\mathbf{\dfrac{a}{\dfrac{b}{c}}= \dfrac{a\times c}{b}}$

$\mathbf{\implies \dfrac{(\frac{\sqrt{x} +2}{x-1}+\frac{\sqrt{x}\\ -2}{x-2\sqrt{x} +1} )(x-1)^{2}}{4x}} }$

By simplification, we have:

$\mathbf{ =\dfrac{\dfrac{(6\sqrt{x}-x^2\sqrt{x}-3x\sqrt{x}+2x+2)(x-1) }{2} }{4x} }$

$\mathbf{P =\dfrac{(6\sqrt{x}-x^2\sqrt{x}-3x\sqrt{x}+2x+2)(x-1) }{8x} }$

Learn more about evaluating the division of surds here:

https://brainly.in/question/27942899

#SPJ1

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2 years ago

F(x)=-3x-7<br> if f(x)=-61, find x

Mars2501 [29]

Answer:

Step-by-step explanation:

You have to set the equations equal to each other and then solve for the variable.

Hope this helps:)

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3 years ago

After a 15% reduction, the sale price of a car is £13175. What was the

OlgaM077 [116]

Answer:

<u>The original price of the car was 11198.75</u>

Step-by-step explanation:

Hope it helps!

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2 years ago

Does the parabola with equation x2 + 5x +9=0 have real or imaginary roots?

vesna_86 [32]

Answer:

b2-4ac , ans is negative . Should have no real roots .

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4 years ago

If x = 3, then the value of 2x + 7 - x is?​

If x = 3, then the value of 2x + 7 - x is?