16t2 - 37t + 20 = 0
Using the quadratic formula,
t = [37 +/- sqrt(372 - 4*16*20)]/(2*16)
= [37 +/- sqrt(89)] / 32
ie t = 0.861438 or t = 1.451062
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168
20 as 10 x 0 = 0 so is just 10 + 10 = 20
-20
x2 + 9x + 20 = 0 ∴(x + 4)(x + 5) = 0 ∴x ∈ {-5, -4}
(3x-4)(x+5)