Finite Math Examples

$7^{x^{2}} - 49^{6 - 2 x} = 0$

Step 1

Move $- 49^{6 - 2 x}$ to the right side of the equation by adding it to both sides.

$7^{x^{2}} = 49^{6 - 2 x}$

Step 2

Create equivalent expressions in the equation that all have equal bases.

$7^{x^{2}} = 7^{2 (6 - 2 x)}$

Step 3

Since the bases are the same, then two expressions are only equal if the exponents are also equal.

$x^{2} = 2 (6 - 2 x)$

Step 4

Solve for $x$ .

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Step 4.1

Simplify $2 (6 - 2 x)$ .

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Step 4.1.1

Apply the distributive property.

$x^{2} = 2 \cdot 6 + 2 (- 2 x)$

Step 4.1.2

Multiply.

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Step 4.1.2.1

Multiply $2$ by $6$ .

$x^{2} = 12 + 2 (- 2 x)$

Step 4.1.2.2

Multiply $- 2$ by $2$ .

$x^{2} = 12 - 4 x$

Step 4.2

Add $4 x$ to both sides of the equation.

$x^{2} + 4 x = 12$

Step 4.3

Subtract $12$ from both sides of the equation.

$x^{2} + 4 x - 12 = 0$

Step 4.4

Factor $x^{2} + 4 x - 12$ using the AC method.

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Step 4.4.1

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $- 12$ and whose sum is $4$ .

$- 2, 6$

Step 4.4.2

Write the factored form using these integers.

$(x - 2) (x + 6) = 0$

Step 4.5

If any individual factor on the left side of the equation is equal to $0$ , the entire expression will be equal to $0$ .

$x - 2 = 0$

$x + 6 = 0$

Step 4.6

Set $x - 2$ equal to $0$ and solve for $x$ .

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Step 4.6.1

Set $x - 2$ equal to $0$ .

$x - 2 = 0$

Step 4.6.2

Add $2$ to both sides of the equation.

$x = 2$

Step 4.7

Set $x + 6$ equal to $0$ and solve for $x$ .

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Step 4.7.1

Set $x + 6$ equal to $0$ .

$x + 6 = 0$

Step 4.7.2

Subtract $6$ from both sides of the equation.

$x = - 6$

Step 4.8

The final solution is all the values that make $(x - 2) (x + 6) = 0$ true.

$x = 2, - 6$