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Maurinko [17]
3 years ago
11

Simplify 3(3x-1)^2=21

Mathematics
2 answers:
GuDViN [60]3 years ago
5 0
27x^2-3=21
27x^2=24

the answer is 27x^s=24
that is my work up there
scoray [572]3 years ago
4 0
3(3x-1)^2=21 

(3x-1)^2 = 7 

3x-1 = square root of 7 

3x = square root of 7 - 1 

x = (square root of 7 - 1)/3
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PLEASE HELP ASAP
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Answer:

First option:  3x^2-5x=-8

Second option: 2x^2=6x-5

Fourth option: -x^2-10x=34

Step-by-step explanation:

Rewrite each equation in the form ax^2+bx+c=0 and then use the Discriminant formula for each equation. This is:

D=b^2-4ac

1) For 3x^2-5x=-8:

 3x^2-5x+8=0

Then:

D=(-5)^2-4(3)(8)=-71

Since D this equation has no real solutions, but has two complex solutions.

2) For 2x^2=6x-5:

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Then:

D=(-6)^2-4(2)(5)=-4

Since D this equation has no real solutions, but has two complex solutions.

3) For 12x=9x^2+4:

 9x^2-12x+4=0

Then:

D=(-12)^2-4(9)(4)=0

Since D=0 this equation has one real solution.

4) For -x^2-10x=34:

 -x^2-10x-34=0

Then:

D=(-10)^2-4(-1)(-34)=-36

Since D, this equation has no real solutions, but has two complex solutions.

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that is the answer

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