Question

x2-2x +4 for x=5 when x=5,x2-2x+4=

Answer 1

Substitute x=5 into the equation x2-2x +4

Answer 2

\[(5)^2-2(5)+4\]

Answer 3

\[\Large \begin{array}{l}
{x^2} - 2x + 4\\
x = 5\\
= {5^2} - 2 \cdot 5 + 4\\
= 25 - 10 + 4\\
= ?
\end{array}\]

Answer 4

Since you're new to algebra Dee2012, a simple polynomial such as the above is evaluated by simply replacing the co-efficient with its value. So everywhere you see x, replace it with 5, and evaluate the expression.