2 years ago

Is a square always a quadrilateral

Mathematics

2 answers:

Illusion [34]2 years ago

6 0

Yes but a quadrilateral isnt always a square

ad-work [718]2 years ago

3 0

Answer:

yes a square is always a quadrilateral

Step-by-step explanation:

but i kite is not always a square

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2 years ago

Marco is 8 years younger than his brother Paolo. If their product of their ages is 105, how old is Marco? plz help

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Answer:

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Step-by-step explanation:

Let

x ----> Marco's age

y ----> Paolo's age

we know that

$x=y-8$ ----> $y=x+8$ ----> equation A

$xy=105$ ----> equation B

substitute equation A in equation B

$x(x+8)=105$

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The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$x^2+8x-105=0$

$a=1\\b=8\\c=-105$

substitute in the formula

$x=\frac{-8(+/-)\sqrt{8^{2}-4(1)(-105)}} {2(1)}$

$x=\frac{-8(+/-)\sqrt{484}} {2}$

$x=\frac{-8(+/-)22} {2}$

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Remember that the solution cannot be a negative number

The solution is x=7

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