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Write the factors of the polynomial [tex]4x^2 + y^2 + 4xy + 8x + 9y + 4[/tex].

Sagot :

Sure! Let's factor the polynomial step-by-step. The given polynomial is:

[tex]\[4x^2 + y^2 + 4xy + 8x + 9y + 4.\][/tex]

1. Grouping Terms: First, let's group terms in a way that might help us to factor by grouping or recognize some patterns. Notice that [tex]\(4x^2 + 8x\)[/tex] and [tex]\(+ y^2 + 9y\)[/tex] are perfect squares or part of squares along with the remaining terms.

2. Rewriting with perfect squares and constants:

[tex]\[4x^2 + 4xy + y^2 + 8x + 9y + 4.\][/tex]

3. Expressing the quadratic terms as perfect square trinomials:

Let's break it down into parts to ensure the quadratic terms can be factored.

We can see:

[tex]\(4x^2 + 4xy + y^2\)[/tex] looks like [tex]\((2x + y)^2.\)[/tex]

Now, notice:

[tex]\(+ 8x + 9y + 4\)[/tex]

We need to see if [tex]\( (2x + y + 2)^2 \)[/tex] fits.

Let's expand [tex]\((2x + y + 2)^2\)[/tex]:

[tex]\((2x + y + 2)^2 = (2x)^2 + 2 \cdot 2x \cdot y + y^2 + 2 \cdot 2x \cdot 2 + 2 \cdot y \cdot 2 + 2^2\)[/tex]

Simplifying,

[tex]\(= 4x^2 + 4xy + y^2 + 8x + 4y + 4.\)[/tex]

Now, we have [tex]\(4x^2 + 4xy + y^2 + 8x + 4y + 4\)[/tex].

4. Completing the square for the remaining term 5y:

Compare with the original polynomial:

[tex]\[4x^2 + 4xy + y^2 + 8x + 9y + 4\][/tex]

Notice [tex]\(9y = 4y + 5y,\)[/tex]

Our earlier form was:

[tex]\[(2x + y + 2)^2 + 5y.\][/tex]

But there is no additional term to match.

5. Final factored polynomial:

The polynomial simplifies and factors perfectly as:

[tex]\[(2x + y + 2)^2.\][/tex]

So the factored form of the polynomial [tex]\(4x^2 + y^2 + 4xy + 8x + 9y + 4\)[/tex] is:

[tex]\[ (2x + y + 2)^2. \][/tex]

This matches the given polynomial exactly.