2 years ago

Find the exact solution of x 3x^2+7=28 A.+√7 B.7 C.+7 D.-7

Mathematics

2 answers:

dolphi86 [110]2 years ago

5 0

Answer:

A. + $\sqrt{7}$

Step-by-step explanation:

3x^2+7=28
3( $+\sqrt{7} ^{2}$ )+7=28

3(7)+7=28

21+7=28
28=28

Hope it helps

yulyashka [42]2 years ago

3 0

Answer:

x = ± $\sqrt{7}$

Step-by-step explanation:

3x² + 7 = 28 ( subtract 7 from both sides )

3x² = 21 ( divide both sides by 3 )

x² = 7 ( take square root of both sides )

x = ± $\sqrt{7}$

that is x = - $\sqrt{7}$ , x = $\sqrt{7}$

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