How to solve (- a)(- a)

1. Factor the equation (x + 2)(x + 3) = 0. 2. Set each factor equal to zero: x + 2 = 0 and x + 3 = 0. 3. Solve for x: x = -2 and x = -3.

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Question

$$(-a)\times(-a)$$

Evaluate

$a^{2}$

Show Solution

Differentiate w.r.t. a

$2a$

Steps Using Derivative Rule for Product

For any two differentiable functions, the derivative of the product of two functions is the first function times the derivative of the second plus the second function times the derivative of the first.

$$-a^{1}\frac{\mathrm{d}}{\mathrm{d}a}(-a^{1})-a^{1}\frac{\mathrm{d}}{\mathrm{d}a}(-a^{1})$$

The derivative of a polynomial is the sum of the derivatives of its terms. The derivative of a constant term is $0$. The derivative of $ax^{n}$ is $nax^{n-1}$.

$$-a^{1}\left(-1\right)a^{1-1}-a^{1}\left(-1\right)a^{1-1}$$

Simplify.

$$-a^{1}\left(-1\right)a^{0}-a^{1}\left(-1\right)a^{0}$$

To multiply powers of the same base, add their exponents.

$$-\left(-1\right)a^{1}-\left(-a^{1}\right)$$

Simplify.

$$a^{1}+a^{1}$$

Combine like terms.

$$\left(1+1\right)a^{1}$$

Add $1$ to $1$.

$$2a^{1}$$

For any term $t$, $t^{1}=t$.

$$2a$$

Show Solution

Example

Question

Evaluate

Solution Steps

Differentiate w.r.t. a

Steps Using Derivative Rule for Product