Question

Solve: 4(x2+3) + 5(x2 -3) = 3(x2+7)​

Answer 1

Answer:

2,-2

Step-by-step explanation:

(4x^2 + 12) + (5x^2 - 15) = 3x^2 + 21

9x^2 - 3 = 3x^2 + 21

6x^2 = 24

X^2 = 4

X = 2, -2

Answer 2

Answer:

x = 2

Step-by-step explanation:

4(x²+3) + 5(x² -3) = 3(x²+7)​

4x²+ 12 + 5x²- 15 = 3x² + 21

9x² - 3 = 3x² + 21                                           Subtract 3x² to both sides

9x² - 3x² - 3 =  21                                            Add 3 to both sides

9x² - 3x²  =  21 + 3

6x² = 24

x² = 4

x = √4 = 2