Question

If 3x-4=8 then find the value of x² -5x+4​

Answer 1

Answer:

4

Step-by-step explanation:

= 3x-4=8

= 3x=12

= x=4

So,

=x²-5x+4

=(x-4)(x-1)

then x=4 is correct answer

Answer 2

If 3x - 4 = 8 then the value of x² - 5x + 4 = 0

Given :

The equation 3x - 4 = 8

To find :

The value of x² - 5x + 4

Solution :

Step 1 of 3 :

Write down the given equation

Here the given equation is

3x - 4 = 8

Step 2 of 3 :

Find the value of x

3x - 4 = 8

⇒ 3x = 8 + 4

⇒ 3x = 12

⇒ x = 12/3

⇒ x = 4

Step 3 of 3 :

Find the value of x² - 5x + 4

Putting x = 4 in x² - 5x + 4 we get

= 4² - (5 × 4) + 4

= 16 - 20 + 4

= - 4 + 4

= 0

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