Formula for volume= side1*side2*side3
Collect like terms.. 7b-9=30 . Add 9 to both sides to isolate b. 7b= 39. Divide both sides by 7. B=39/7 maybe there was a problem is this equation maybe it was 7b+9=30 instead of 7b-9 =30
Hello,
(x+3)²=x²+2*3*x+3²=x²+6x+9
Answer A
