Work out the two possible answers 2b2 (2b squared) + 4 = 12

b = ±2

Step-by-step explanation:

2b^2 + 4 = 12

Subtract 4 from each side

2b^2 + 4-4=12-4

2b^2 = 8

Divide by 2 on each side

2b^2 / 2 = 8/2

b^2 = 4

Take the square root on each side

sqrt (b^2) = ± sqrt (4)

b = ±2