Question

(x+3) (x-3) = 40. Find possible value of x.

Answer 1

Answer:

(x+3)(x−3)=40

Let us simplify the given equation,

x

2

−3x+3x−9=40

x

2

−9−40=0

x

2

−49=0

x

2

=49

x=

49

=±7

∴ Value of x=7,−7

Answer 2

Answer:

7

Step-by-step explanation:

$( x+ 3)(x - 3) = 40 \\ \\( {x}^{2} - {3}^{2} ) = 40 \\ \\ {x}^{2} - 9 = 40 \\ \\ {x }^{2} = 40 + 9 \\ \\ x = \sqrt{49} \\ x = 7 \: \: (ans.)$

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