Question

$(x + 3)(x - 3) = 40$
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Answer 1

Answer:

Hey there

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

Hope it helps you

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Answer 2

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

${x}^{2} - {3}^{2} = 40$

${x}^{2} - 9 = 40 \\ {x}^{2} = 40 + 9 \\ \implies {x}^{2} = 49 \\\implies x = 7 (as \: {7}^{2} = 49$

hope this helps you xD

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