A4-b4=(a-b)(a+b)(a2+b2)?

I’m assuming you’re asking for the proof here.

Since you’ve used a4 to represent a^4, I’m going to use that too.

Let a2= X; b2= Y

Now, a4-b4= X2-Y2

= (X + Y) (X - Y)

=(a2 + b2) (a2- b2)

=(a2 + b2) (a + b) (a - b)

=(a + b) (a - b) (a2 + b2)

Hence, proved.

Hope that helped!

Step-by-step explanation:

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

x = 2

step-by-step explanation:

if sr parallel to ba then the sides bc and ac are in proportion, that is

= ← substitute values

= ( cross- multiply )

27x = 6(4x + 1)

27x = 24x + 6 ( subtract 24x from both sides )

3x = 6 ( divide both sides by 3 )

x = 2