Question

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

Answer 1

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

Answer 2

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 = $\sqrt{7}$