Question
Asked Aug 20, 2019
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x2-4x-21=0

solution set is?

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Expert Answer

Step 1

Refer to the question, we have to find the value of x for the quadratic equation.

x24x 21 0
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x24x 21 0

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Step 2

To solve any quadratic equation ax2+x+c = 0 use quadratic equation formula as,

-bt
2a
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-bt 2a

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Step 3

Substitute a=1 , b=-4 and c=-21 for the provided equat...

-(4) 4)4-1(-21)
2.1
N-4)4-1-21
4+
2.1
4 v100
2
4 10
2
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-(4) 4)4-1(-21) 2.1 N-4)4-1-21 4+ 2.1 4 v100 2 4 10 2

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