Question

Solve the equation.
4x^2 - 20 = 5

Answer 1

4x² - 20 = 5

4x² - 25 = 0

Now factor 4x² - 25.

Answer 2

\[4x ^{2}-20=5\]\[4x ^{2}-20+20=5+25\]\[4x ^{2}=25\]\[x ^{2}=\frac{ 25 }{ 4 }\]\[x=\sqrt{\frac{ 25 }{ 4 }}\]\[x=\frac{ 5 }{ 2 }\]\[x=2\frac{ 1 }{ 2 }\]

Answer 3

@EchaSetiaWijaya X is also -2.5. Remember, √(x²) = |x|

Answer 4

yes, thanks for correction