Question

Solve the following equation 3x^2 + 4 = 79

Answer 1

ANSWER:

X=5

Step-by-step explanation:

3x^2=79

=3x^2=79-4=75

=x^2=75÷3=25

=×=underroot25=5

=×=5

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Answer 2

The value of x = - 5 , 5

Given :

The equation 3x² + 4 = 79

To find :

The value of x

Solution :

Step 1 of 2 :

Write down the given equation

Here the given equation is 3x² + 4 = 79

Step 2 of 2 :

Find the value of x

$\displaystyle \sf{ 3 {x}^{2} + 4 = 79 }$

$\displaystyle \sf{ \implies 3 {x}^{2} = 79 - 4}$

$\displaystyle \sf{ \implies 3 {x}^{2} = 75}$

$\displaystyle \sf{ \implies {x}^{2} = \frac{75}{3} }$

$\displaystyle \sf{ \implies {x}^{2} = 25}$

$\displaystyle \sf{ \implies x = \pm \: \sqrt{25} }$

$\displaystyle \sf{ \implies x = \pm \: 5 }$

Hence the required solution is x = - 5 , 5

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