Which is equivalent to (9 y squared minus 4 x)(9 y squared + 4 x), and what type of special product is it? 81 y superscript 4 baseline minus 16 x squared, a perfect square trinomial 81 y superscript 4 baseline minus 16 x squared, the difference of squares 81 y superscript 4 baseline minus 72 x y squared minus 16 x squared, a perfect square trinomial 81 y superscript 4 baseline minus 72 x y squared minus 16 x squared, the difference of squares

Option B 81 y Superscript 4 Baseline minus 16 x squared, the difference of squares is correct.

Step-by-step explanation:

We need to solve:

(9y^2 -4x)(9y^2+4x)

Finding the product:

9y^2(9y^2+4x) -4x(9y^2+4x)

81y^4+36y^2x-36y^2x-16x^2

81y^4 - 16x^2

Type of Special product

The product is differences of square because

81y^4 = (9y^2)^2

and 16x^2 = (4x)^2

So, 81y^4 - 16x^2 =  (9y^2)^2 - (4x)^2

Hence Option B 81 y Superscript 4 Baseline minus 16 x squared, the difference of squares is correct.

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.

hi! i think the answer is 1/2 : )