Check each of the given numbers to see if they are solutions to each equation. Show your checks and summarize which are solutions and which are not:

Question

a). n=4n+5 n=-3,-5/3,0,5/3

b). m-2m²=-120 m=10,8,1,-2,-7.5

Answer 1

n = 4n + 5

-3n = 5

n = -5/3

m - 2m^2 = -120

2m^2 - m - 120 = 0

use quadratic formula: -b +/- sqrt(b^2 - 4ac)

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2a

where a = 2, b = 1 and c = -120

solutions are 8 and -7.5