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2 years ago

Have trouble with this question need help pls

Mathematics

1 answer:

irga5000 [103]2 years ago

3 0

Two negatives cancel out, so you’re just doing -2 plus 0.7. So you’ll start at -2 and move the arrow until you reach -1.3

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Tju [1.3M]

Answer:

Step-by-step explanation:

Rationalize the denominator of b. So, multiply the numerator and denominator by $\sqrt{x}$

$b = \frac{(1-2\sqrt{x}) *\sqrt{x}}{\sqrt{x}*\sqrt{x} }=\frac{1*\sqrt{x} -2\sqrt{x} *\sqrt{x} }{\sqrt{x} *\sqrt{x} }\\\\=\frac{\sqrt{x} -2x}{x}\\$

Now, find a +b

$a +b = \frac{2x+\sqrt{x} }{x}+\frac{\sqrt{x} -2x}{x}\\\\=\frac{2x+\sqrt{x} +\sqrt{x} -2x}{x}$

Combine like terms

$= \frac{2x-2x+\sqrt{x} +\sqrt{x} }{x}\\\\=\frac{2\sqrt{x} }{x}$

Now find (a + b)²

(a +b)² = $(\frac{2\sqrt{x} }{x})^{2}$

$= \frac{2^{2}*(\sqrt{x} )^{2}}{x^{2}}\\\\= \frac{4* x}{x^{2}}\\\\= \frac{4}{x}$

Hint: $\sqrt{x} *\sqrt{x} =\sqrt{x*x}=x$

5 0

2 years ago

Trick question<br> whats 50 divided by half plus 10

hoa [83]

$50:\frac{1}{2}+10=50\cdot\frac{2}{1}+10=50\cdot2+10=100+10=\boxed{110}$

5 0

3 years ago

Write the expression as a product.<br> 25-(a + 7)^2

Nastasia [14]

$25 - ({a + 7})^{2} =$

$(5 + (a + 7))(5 - (a + 7)) =$

$(a + 12)( - a - 2)$

Have a great day ♡

6 0

2 years ago

Read 2 more answers

The square of a number is 12 less then 7 times the number. 2hat is the number

Salsk061 [2.6K]

Hello.

The are answer is 4 or 3
<span>

3^2 = 7(3) - 12
9 = 21 - 12
9 = 9

</span>4^2 = 7(4) - 12
16 = 28 - 12
16 = 16

Have a nice day

3 0

2 years ago

Circle theorem <br> This is a very easy question but i just can't seem to be able to answer it

xxMikexx [17]

The measure of <FCD is 77 degrees

<h3>Circle geometry</h3>

From the given diagram, we have the following:

m<FCD + 90 + m<F = 180 degrees

Given the following parameters

m<BEO = 13 degrees = m<F

Substitute into the formula:

m<FCD + 90 +13 = 180 degrees

m<FCD = 180 - 103

m<FCD = 77 degrees

Hence the measure of <FCD is 77 degrees

Learn more on circle geometry here; brainly.com/question/24375372

5 0

2 years ago