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solniwko [45]
3 years ago
15

Could someone help me with a question?

Mathematics
1 answer:
11111nata11111 [884]3 years ago
5 0
Whats the question ill be happy to help
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Step-by-step explanation:

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3 years ago
Diego is solving the equation x^2-12x = 21
uysha [10]

Answer:

The solutions to the quadratic equations will be:

x=\sqrt{57}+6,\:x=-\sqrt{57}+6

Step-by-step explanation:

Given the expression

x^2-12x\:=\:21

Let us solve the equation by completing the square

x^2-12x\:=\:21

Add (-6)² to both sides

x^2-12x+\left(-6\right)^2=21+\left(-6\right)^2

simplify

x^2-12x+\left(-6\right)^2=57

Apply perfect square formula: (a-b)² = a²-2ab+b²

i.e.

x^2-12x+\left(-6\right)^2=\left(x-6\right)^2

so the expression becomes

\left(x-6\right)^2=57

\mathrm{For\:}f^2\left(x\right)=a\mathrm{\:the\:solutions\:are\:}f\left(x\right)=\sqrt{a},\:-\sqrt{a}

solve

x-6=\sqrt{57}

add 6 to both sides

x-6+6=\sqrt{57}+6

Simplify

x=\sqrt{57}+6

also solving

x-6=-\sqrt{57}

add 6 to both sides

x-6+6=-\sqrt{57}+6

Simplify

x=-\sqrt{57}+6

Therefore, the solutions to the quadratic equation will be:

x=\sqrt{57}+6,\:x=-\sqrt{57}+6

5 0
3 years ago
Is a cube a polygon? Why or why not?
myrzilka [38]
No. A cube is a 3D figure and polygon is a 2D one.
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Venla is 5 years older than her cousin Kora. Write an equation for the age of Venla, v, when Kora is k years old
Maksim231197 [3]
V=k+5

Here you go, hope this helps
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4 years ago
Solve division problem around answer to nearest hundredth 9.2 / 52.063
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