13. What is the area of a square whose side is 5m + 3 if the formula is
A= (side)?
A. 25m2 + 9 B. 25m2+30m +9 C.10m +6 D.25m2-9
14.What is the volume of a cube whose side measures 2x + 1 ? If V = (side)
A. 8x3 +8x2 +4x + 1 B. 8x3 + 12x2 + 6x + 1
C. 6x3 4x2 + 4x + 1 D. 8x3 + 8x2 + 2x + 1
I'm need help!
A= (side)?
A. 25m2 + 9 B. 25m2+30m +9 C.10m +6 D.25m2-9
14.What is the volume of a cube whose side measures 2x + 1 ? If V = (side)
A. 8x3 +8x2 +4x + 1 B. 8x3 + 12x2 + 6x + 1
C. 6x3 4x2 + 4x + 1 D. 8x3 + 8x2 + 2x + 1
I'm need help!
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Answer:
13. B.
14. B. 8x³ + 12x² + 6x+1
Step-by-step explanation:
13.
14. V = (2x + 1)³
= (2x + 1)(2x + 1)(2x + 1)
= (4x² + 2x + 2x + 1)(2x + 1)
= (4x² + 4x + 1)(2x + 1)
= 8x³ + 4x² + 8x² + 4x +2x+1
= 8x³ + 12x² + 6x+1