Question

Find the following by using Identity-1.
(1) (2x + 5)
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Answer 1

Answer:

3

Explanation:

2x+5=y

X=-1

2*(-1)+5=y

= -2+5=3

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Answer 2

=> (2x + 5)²

=> (2x + 5)²

=>[USING IDENTITY -1]

=> (a+b)² = a² + 2ab + b²

L.H.S => (a+b)²

Let,us verify here that,

=> L.H.S. = (a+b)²

=>R.H.S = a² + 2ab + b²

VERIFYING ------------»

(value )=> a =2

(value) => b = 5

____________________

=>R.H.S = a² + 2ab + b²

=>R.H.S = 2² + 2×2×5 + 5²

=>R.H.S = 4 + 20 + 25

=>R.H.S = 4x +20 + 25

______________________________

Hence, Here L.H.S = R.H.S (VERIFIED)

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