Solve 21=1(2+3)-1(-1-6)+2(-1+4)

$$21 = 1 ( 2 + 3 ) - 1 ( - 1 - 6 ) + 2 ( - 1 + 4 )$$

Verify

Solution Steps

Add 2 and 3 to get 5.

$$21=1\times 5-1\left(-1-6\right)+2\left(-1+4\right)$$

Multiply 1 and 5 to get 5.

$$21=5-1\left(-1-6\right)+2\left(-1+4\right)$$

Subtract 6 from -1 to get -7.

$$21=5-1\left(-7\right)+2\left(-1+4\right)$$

Multiply 1 and -7 to get -7.

$$21=5-\left(-7\right)+2\left(-1+4\right)$$

The opposite of -7 is 7.

$$21=5+7+2\left(-1+4\right)$$

Add 5 and 7 to get 12.

$$21=12+2\left(-1+4\right)$$

Add -1 and 4 to get 3.

$$21=12+2\times 3$$

Multiply 2 and 3 to get 6.

$$21=12+6$$

Add 12 and 6 to get 18.

$$21=18$$

Compare 21 and 18.

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