<img src="https://tex.z-dn.net/?f=7x%5E%7B2%7D%20-3%3D60" id="TexFormula1" title="7x^{2} -3=60" alt="7x^{2} -3=60" align="absmid

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Fantom [35]

3 years ago

dle" class="latex-formula">

Mathematics

1 answer:

Pavel [41]3 years ago

7 0

Answer:

Step-by-step explanation:

7x² - 3 = 60

7x² - 3 - 60 = 0

7x² - 63 = 0

Simplify the terms

Divide both terms by 7

That's

x² - 9 = 0

Solve the quadratic equation

Use difference of two squares

That's

a² - b² = ( a + b)(a - b)

x² - 9 = 0

(x + 3)(x - 3) = 0

x + 3 = 0 x - 3 = 0

x = - 3 x = 3

Hope this helps you

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