Question

7 (a² +b²)²-15 (a⁴-b⁴)+ 8 (a²-b²) ²​

Answer 1

7(a² +b²)² - 15(a⁴-b⁴) + 8(a²-b²)²

7(a² +b²)² - 15(a²-b²)(a²+b²) + 8(a²-b²)² →(1)

Let the (a²+b²) = x & (a²-b²) = y

Then eqn (1) became,

7x² - 15xy + 8y²

7x² - 7xy - 8xy + 8y²

7x(x - y) - 8y(x - y)

(x - y)(7x - 8y)

Putting value of x and y

(a² + b² - a² + b²)(7a² + 7b² - 8a² + 8b²)

2b²(15b² - a²)

Answer 2

Step-by-step explanation:

I hope this will help you...