Question

Use the identity (x + a)(x + b) = x2 + (a + b)x + ab to find the following products.
(i) (x + 3) (x + 7)
(ii) (4x + 5)(4x + 1)​

Answer 1

Step-by-step explanation:

$1) (x + 3)(x + 7) \\ {x}^{2} + (3 + 7)x+ (3 \times 7) \\ {x}^{2} + 10x + 21 \\ \\ 2)(4x + 5)(4x + 1) \\ 4 {x}^{2} + (5 \times 1)4x + (5 \times 1) \\ 8 {x}^{2} + 20 x + 5$

Here is your answer!!!

Answer 2

Answer:

Given: (4x−5)(4x−1)

Using,(x+a)(x+b)=x

2

+(a+b)x+ab we get,

=16x

2

+(−5−1)4x+(−5)(−1)

=16x

2

−24x+5

Step-by-step explanation:

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