Question

How do you evaluate `2x ^ { 2} - 5y ^ { 2} ) ( x ^ { 2} + 3y ^ { 2}`)?

Answer 1

`4x^4 + x^2y^2 - 15y^4`

Explanation:

`(2x^2-5y^2)(x^2+3y^2)`

`4x^4 - 5x^2y^2 + 6x^2y^2 -15y^4`

`4x^4 + x^2y^2 - 15y^4`