180 =15t + 7.5t2 ***
please solve this quadratic equation
Best answer will be marked for sure !!!
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Answer:6,-4
Step-by-step explanation:
180=15t+7.5t2
Multiplying 2 both sides,
360=30t+15t2
15t2+30t-360=0
15(t2+2t-24)=0 (Taking 15 common)
t2+2t-24=0
t2+6t-4t-24=0 (as 24=6*4 and 2t=6t-4t)
t(t+6)-4(t+6)=0
(t+6)(t-4)=0
t=6,-4 (answer)
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