Determine the expression that shows a difference of perfect squares and factor it, showing work.
16x2 − 81
14x2− 49
9x2 + 100

Answer is 1st option

16x²-81

(4x)² - 9²

Thus it is the difference of squares of 4x and 9

Factorising (4x)² - 9² , we would get:

(4x + 9)(4x - 9)

As a² - b² = ( a + b)(a - b)

your answer is the frist one

hop i

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft