Solve the equation. If necessary round to the nearest tenth 4x^2=81 A. 2.25, -2.25 B. 9, -9 C. 20.25, -20.25 D. 4.5, -4.5

asked Dec 9, 2018 77.4k views

3 votes

Solve the equation. If necessary round to the nearest tenth 4x^2=81

A. 2.25, -2.25
B. 9, -9
C. 20.25, -20.25
D. 4.5, -4.5

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6 votes

$4x^2=81 \\ x^2=81/4 \\ x^2 = 20.25 \\ x=б √(20.25) \\ x=б4.5$

D. 4.5, -4.5

Sebazzz answered Dec 16, 2018

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