Question

Q – 2 Solve the following according to the given instructions (08)

Evaluate using suitableIdentities.

1. (2a + 7) (2a – 7) 2. (b – 7)2

Using Identities, Evaluate the following: 1. 512

- 492

2. 103 X 104

give right answer if not I report​

Answer 1

Answer:

(2a − 7) (2a — 7) = (2a — 7)² using identity (a - b)² = a² - 2ab + b² (2a − 7)² = (2a)² - 2 × 2a × 7+7²

(2a — 7)² = 4a² - 28a + 49

Step-by-step explanation:

1)20

2)10,712 is your answer

Answer 2

Answer:

Evaluate using suitable identities.

1. Ans- (a²-b²)= (a+b) (a-b)

↪(2a)² - 7²

↪4a² - 49

2. Ans- identity: (a-b)²= a²+b²-2ab

↪(b-7)² = b² + 7² - 2×7×b

↪(b-7)² = b² + 49 - 14b

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$\sf \underline\green{ \star \: Using \: identities, \: evaluate \: the \: following : }$

1. 512-492

$↪ \mathfrak \red{identity : } \frak \blue{simplify \: the \: expression }$

We get

Therefore, value of the given expression is 200.

2. 103×104

$↪ \frak {(100 + 3) \times (100 + 4)}$

$\frak {10000 + 300 + 400 + 12}$

$\frak{10712}$

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