Question

HELP!!!‼️‼️⚠️⚠️‼️‼️⚠️⚠️

Answer 1

Answer:

last option

x² + 81 = x² + 20x + 100

Step-by-step explanation:

$\sqrt{ {x}^{2} + 81 } = x + 10$

squaring both sides

$(\sqrt{ {x}^{2} + 81 } )^{2} = {(x + 10) }^{2} \\ {x}^{2} + 81 = {(x + 10)}^{2}$

using the identity

(a + b)² = a² + b² + 2ab

for (x + 10) ²

${x}^{2} + 81 = {x}^{2} + 20x + 100$

hence, option D