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√(8t+9)=2+3t
в квадрат левую и правую части
8t+9=(2+3t)²
8t+9=4+12t+9t²
9t²+4t-5=0
D=b²-4ac=4²-4*9*(-5)=16+180=196
t1=(-b-√D)/2a=(-4-14)/(2*9)= - 18/18= - 1
t2=(-b+√D)/2a=(-4+14)/(2*9)= 10/18=5/9
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!!!!!!!!!!!!!!!!!!!!!!
√(8t+9)=2+3t
в квадрат левую и правую части
8t+9=(2+3t)²
8t+9=4+12t+9t²
9t²+4t-5=0
D=b²-4ac=4²-4*9*(-5)=16+180=196
t1=(-b-√D)/2a=(-4-14)/(2*9)= - 18/18= - 1
t2=(-b+√D)/2a=(-4+14)/(2*9)= 10/18=5/9