Solve Evaluate 3sqrt(7) * (- 7 - 2sqrt(7)) | Equatix - Math Solver

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Example

3(r+2s)=2t-4

a⋅(b-2)=3b

3(r+2s)=2t-4

a⋅(b-2)=3b

Question

$$3 \sqrt { 7 } ( - 7 - 2 \sqrt { 7 } )$$

Evaluate

$-21\sqrt{7}-42\approx -97.560777532$

Solution Steps

Use the distributive property to multiply $3\sqrt{7}$ by $-7-2\sqrt{7}$.

$$-21\sqrt{7}-6\left(\sqrt{7}\right)^{2}$$

The square of $\sqrt{7}$ is $7$.

$$-21\sqrt{7}-6\times 7$$

Multiply $-6$ and $7$ to get $-42$.

$$-21\sqrt{7}-42$$