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If [tex]\( 2a - b + c = 0 \)[/tex], then show that [tex]\( 4a^2 - b^2 + c^2 + 4ac = 0 \)[/tex].

Sagot :

Certainly! Let's solve the problem step-by-step.

We are given the equation:

[tex]\[ 2a - b + c = 0 \][/tex]

We need to demonstrate that:

[tex]\[ 4a^2 - b^2 + c^2 + 4ac = 0 \][/tex]

First, let's express [tex]\(b\)[/tex] in terms of [tex]\(a\)[/tex] and [tex]\(c\)[/tex] from the given equation [tex]\(2a - b + c = 0\)[/tex]:

[tex]\[ 2a + c = b \][/tex]

Now, we substitute [tex]\(b = 2a + c\)[/tex] into the expression we need to prove:

Consider the expression [tex]\(4a^2 - b^2 + c^2 + 4ac\)[/tex]:

By substituting [tex]\(b = 2a + c\)[/tex], the expression becomes:

[tex]\[ 4a^2 - (2a + c)^2 + c^2 + 4ac \][/tex]

Next, let's expand [tex]\((2a + c)^2\)[/tex]:

[tex]\[ (2a + c)^2 = 4a^2 + 4ac + c^2 \][/tex]

Now, substitute this expansion back into our expression:

[tex]\[ 4a^2 - (4a^2 + 4ac + c^2) + c^2 + 4ac \][/tex]

Simplify this step-by-step:

[tex]\[ = 4a^2 - 4a^2 - 4ac - c^2 + c^2 + 4ac \][/tex]

Combine like terms:

[tex]\[ = 4a^2 - 4a^2 - 4ac - c^2 + c^2 + 4ac \][/tex]

Notice that everything cancels out:

[tex]\[ = 0 \][/tex]

Thus, we have shown that:

[tex]\[ 4a^2 - b^2 + c^2 + 4ac = 0 \][/tex]

Therefore, given [tex]\(2a - b + c = 0\)[/tex], we've proven that [tex]\(4a^2 - b^2 + c^2 + 4ac = 0\)[/tex].