Question

ise the identity (x+a)(x+b)=x2+(a+b)x+ ab to find the following products

(x+3) (x+7)
(4x+5)(4x+1)
please answer me....fast ...i will mark the right answer as brainliest
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Answer 1

Step-by-step explanation:

1. $(x+3)(x+7)$

$= x²+(3+7)x+3×7$

$= x²+10x+21$

2. $(4x+5)(4x+1)$

$= (4x)²+(5+1)4x+5×1$

$= 16x²+6×4x+5$

$= 16x²+24x+5$