Question

If x=-5 find the value of the expression: c)x²-5x+4​

Answer 1

Answer:

put the value of x in equation

$= {5}^{2} - 5 \times 5 + 4 \\ = 25 - 25 + 4 \\ = 0 + 4 \\ = 4$

Answer 2

Answer -

• The required number is 54.

To find -

• The value of the expression - x² - 5x + 4, if x = -5.

Step-by-step explanation -

Here, it is given that -

• The expression = x² - 5x + 4.
• The value of x = -5.

Therefore,

$\longrightarrow$ x² - 5x + 4

$\longrightarrow$ (-5)² - 5 (-5) + 4

$\longrightarrow$ 25 - 5 (-5) + 4

$\longrightarrow$ 25 - (-25) + 4

$\longrightarrow$ 25 + 25 + 4

$\longrightarrow$ 50 + 4

$\longrightarrow$ 54.

Thus -

• The value of x is 54.

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Verification -

Let the LHS be "x² - 5x + 4" and the RHS be "54".

• To check our answer, let's substitute the value of "x" in the equation and see whether LHS = RHS.

LHS :

$\longrightarrow$ x² - 5x + 4

$\longrightarrow$ 25 - (-25) + 4

$\longrightarrow$ 25 + 25 + 4

$\longrightarrow$ 50 + 4

$\longrightarrow$ 54

RHS :

$\longrightarrow$ 54

LHS = RHS.

Hence verified!

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