Question

use the identity (x+a) (x+b) = x2+(a+b)x+ab<br />4. (4x+5) (4x-1)​

Answer 1

Answer:

16x²+16x-5

Step-by-step explanation:

(y+a)(y+b) = y²+ (a+b)y +ab

Putting y=4x; a=5; b=-1

(4x+5)(4x-1) = 16x² + (5-1)4x + 5(-1)

16x²+16x-5

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