Question

(4x^2+15) (4x^2+5) by using identity

Answer 1

Answer:

Identity is

(x+a)(x+b)=x²+(a+b)x+ab

Step-by-step explanation:

(4x²+15)(4x²+5)

(4x²)²+(15+5)(4x²)+15(5)

16x⁴+20(4x²)+75

16x⁴+80x²+75