Question

simplify (√7+3)(√7-3)​

Answer 1

Answer:

the answer for this question is 7-9= -2

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Answer 2

ANSWER:

• Value of above expression is (-2).

GIVEN:

• (√7+3)(√7-3)

TO FIND:

• Value of above expression:

SOLUTION:

= (√7+3)(√7-3)

= √7(√7-3)+3(√7-3)

= 7-3√7+3√7-9

= 7-9

= (-2)

OR:

IDENTIFY USED:

• (a+b)(a-b) = a²-b²

= (√7+3)(√7-3)

= (√7)²-(3)²

= 7-9

= (-2)

NOTE:

Some important formulas:

(a+b)² = a²+b²+2ab

(a-b)² = a²+b²-2ab

(a+b)(a-b) = a²-b²

(a+b)³ = a³+b³+3ab(a+b)

(a-b)³ = a³-b³-3ab(a-b)

a³+b³ = (a+b)(a²+b²-ab)

a³-b³ = (a-b)(a²+b²+ab)

(a+b)² = (a-b)²+4ab

(a-b)² = (a+b)²-4ab