Simplify 3 x a x 3 x a

first we should to multiply 3 and 3 and at last we should multiply a and a then the answer comes 9asquare

Take out the constants (3×3)aa

simplify 3 × 3 to 9aa

use product rule : xᵃ xᵇ = xᵃ ⁺ ᵇ

= 9a^2

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,