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Verdich [7]
2 years ago
11

Which equation is true?

Mathematics
1 answer:
amid [387]2 years ago
5 0

Answer:

(3x-5)(3x+5)

Step-by-step explanation:

Difference of squares states that:

a^2-b^2=(a-b)(a+b)

In this case...

a^2=9x^2\\\sqrt{a^2}=\sqrt{9x^2}\ (take\ the\ square\ root\ of\ both\ sides)\\a=3x

b^2=25\\\sqrt{b^2}=\sqrt{25}\ (take\ the\ square\ root\ of\ both\ sides)\\b=5

This means that...

9x^2-25=(3x-5)(3x+5)

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