Question

find using identity : (7 y ² + 2] (7 y 2 - 5) please tell very urgent​

Answer 1

ANSWER:

The answer is 49y⁴-21y²-10

STEP BY STEP EXPLANATION:

(7y²+2)(7y²-5) is in the form of

(x+a)(x+b)=x²+(a+b)x+ab

from (7y²+2)(7y²-5) , a=2

b=-5

x=7y²

(7y²+2)(7y²-5) = (7y²)² + (2+(-5))7y²+ 2×-5

7²y⁴+ (-3)7y² + (-10)

49y⁴-21y²-10.

Here is the answer.