4) 31-t²=-(t-9)²
31-t²=-(t²-18t+81)
31-t²=-t²+18t-81
31-t²+t²-18t+81=0
-18t+112=0
-18t=-112
t=112/18
t=56/9
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4) 31-t²=-(t-9)²
31-t²=-(t²-18t+81)
31-t²=-t²+18t-81
31-t²+t²-18t+81=0
-18t+112=0
-18t=-112
t=112/18
t=56/9