Question

(ii) (x+3)(x-3) = 40​

Answer 1

Answer:

7

Step-by-step explanation:

$\implies$ $\sf{ (x+3)(x-3) = 40}$

[ Formula : (x+y)(x-y) = x² - y² ]

$\implies$ $\sf{x^2 - 3^2 = 40 }$

$\implies$ $\sf{ x^2 -9 = 40}$

$\implies$ $\sf{x^2 = 49 }$

$\implies$ $\sf{ x = \sqrt{49 }}$

$\therefore$ $\boxed{\sf{x = 7 }}$

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Answer 2

Answer:

x=7

Step-by-step explanation:

(x+3)(x-3) = 40

x²-3²=40

x²=40+9

x²=49

x=7