The distance covered by a bike is given by the expression 2x2 +6x-20 km. The time taken by the bike to cover this distance is given by the expression x-2 hr. Find the speed of the bike at x = 4
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Answer:
d = 36km
t = 2hrs
Step-by-step explanation:
d = 2x^2 + 6x - 20
d = 2(4)^2 + 6(4) - 20
d = 2(16) + 24 - 20
d = 32 + 24 - 20
d = 56 - 20
d = 36
t = x - 2
t = 4 - 2
t = 2