A rectangular floor has an area of 2x² + 5x – 12. What is the actual dimension of the floor if x = 3 cm?
a. 2 cm by 12 cm
b. 3 cm by 8 cm
c. 3 cm by 7 cm
d. 2 cm by 9 cm
Answers
Answered by
4
Answer:
21
Step-by-step explanation:
Given area= 2x^2 +5x -12
if x =3
actual area = 2x^2 + 5x - 12
= 2(3)^2 +5*3 -12
= 18 + 15 -12
=21
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