Simplify (a+2b-10)^2

${(a + 2 b - 10)}^{2}$

Rewrite ${(a + 2 b - 10)}^{2}$ as $(a + 2 b - 10) (a + 2 b - 10)$ .

$(a + 2 b - 10) (a + 2 b - 10)$

Expand $(a + 2 b - 10) (a + 2 b - 10)$ by multiplying each term in the first expression by each term in the second expression.

$a \cdot a + a (2 b) + a \cdot - 10 + 2 b a + 2 b (2 b) + 2 b \cdot - 10 - 10 a - 10 (2 b) - 10 \cdot - 10$

Simplify each term.

Multiply $a$ by $a$ .

$a^{2} + a (2 b) + a \cdot - 10 + 2 b a + 2 b (2 b) + 2 b \cdot - 10 - 10 a - 10 (2 b) - 10 \cdot - 10$

Rewrite using the commutative property of multiplication.

$a^{2} + 2 a b + a \cdot - 10 + 2 b a + 2 b (2 b) + 2 b \cdot - 10 - 10 a - 10 (2 b) - 10 \cdot - 10$

Move $- 10$ to the left of $a$ .

$a^{2} + 2 a b - 10 \cdot a + 2 b a + 2 b (2 b) + 2 b \cdot - 10 - 10 a - 10 (2 b) - 10 \cdot - 10$

Rewrite using the commutative property of multiplication.

$a^{2} + 2 a b - 10 a + 2 b a + 2 \cdot 2 b \cdot b + 2 b \cdot - 10 - 10 a - 10 (2 b) - 10 \cdot - 10$

Multiply $b$ by $b$ by adding the exponents.

Move $b$ .

$a^{2} + 2 a b - 10 a + 2 b a + 2 \cdot 2 (b \cdot b) + 2 b \cdot - 10 - 10 a - 10 (2 b) - 10 \cdot - 10$

Multiply $b$ by $b$ .

$a^{2} + 2 a b - 10 a + 2 b a + 2 \cdot 2 b^{2} + 2 b \cdot - 10 - 10 a - 10 (2 b) - 10 \cdot - 10$

Multiply $2$ by $2$ .

$a^{2} + 2 a b - 10 a + 2 b a + 4 b^{2} + 2 b \cdot - 10 - 10 a - 10 (2 b) - 10 \cdot - 10$

Multiply $- 10$ by $2$ .

$a^{2} + 2 a b - 10 a + 2 b a + 4 b^{2} - 20 b - 10 a - 10 (2 b) - 10 \cdot - 10$

Multiply $2$ by $- 10$ .

$a^{2} + 2 a b - 10 a + 2 b a + 4 b^{2} - 20 b - 10 a - 20 b - 10 \cdot - 10$

Multiply $- 10$ by $- 10$ .

$a^{2} + 2 a b - 10 a + 2 b a + 4 b^{2} - 20 b - 10 a - 20 b + 100$

Add $2 a b$ and $2 b a$ .

Move $b$ .

$a^{2} - 10 a + 2 a b + 2 a b + 4 b^{2} - 20 b - 10 a - 20 b + 100$

Add $2 a b$ and $2 a b$ .

$a^{2} - 10 a + 4 a b + 4 b^{2} - 20 b - 10 a - 20 b + 100$

Subtract $10 a$ from $- 10 a$ .

$a^{2} - 20 a + 4 a b + 4 b^{2} - 20 b - 20 b + 100$

Subtract $20 b$ from $- 20 b$ .

$a^{2} - 20 a + 4 a b + 4 b^{2} - 40 b + 100$

Move $- 20 a$ .

$a^{2} + 4 a b + 4 b^{2} - 20 a - 40 b + 100$